resource/cloudflare_ruleset: rename mitigation_expression to counting_expression

[jacobbednarz]

Internally, the mitigation_expression field has moved to
counting_expression to better match its use. This updates the schema
to reflect those changes and migrate state files to match.

While technically breaking, there has already been an internal migration performed for the small handful of customers actually relying on this field leaving us to clean up this last piece with a migration.

Depends on cloudflare/cloudflare-go#808

[jacobbednarz]

acceptance tests are all passing

TF_ACC=1 go test $(go list ./...) -v -run "^TestAccCloudflareRuleset_" -count 1 -parallel 1 -timeout 120m -parallel 1
go: downloading github.com/cloudflare/cloudflare-go v0.33.0
?   	github.com/cloudflare/terraform-provider-cloudflare	[no test files]
=== RUN   TestAccCloudflareRuleset_WAFBasic
=== PAUSE TestAccCloudflareRuleset_WAFBasic
=== RUN   TestAccCloudflareRuleset_WAFManagedRuleset
=== PAUSE TestAccCloudflareRuleset_WAFManagedRuleset
=== RUN   TestAccCloudflareRuleset_WAFManagedRulesetOWASP
=== PAUSE TestAccCloudflareRuleset_WAFManagedRulesetOWASP
=== RUN   TestAccCloudflareRuleset_WAFManagedRulesetOWASPBlockXSSWithAnomalyOver60
=== PAUSE TestAccCloudflareRuleset_WAFManagedRulesetOWASPBlockXSSWithAnomalyOver60
=== RUN   TestAccCloudflareRuleset_WAFManagedRulesetOWASPOnlyPL1
=== PAUSE TestAccCloudflareRuleset_WAFManagedRulesetOWASPOnlyPL1
=== RUN   TestAccCloudflareRuleset_WAFManagedRulesetDeployMultiple
=== PAUSE TestAccCloudflareRuleset_WAFManagedRulesetDeployMultiple
=== RUN   TestAccCloudflareRuleset_WAFManagedRulesetDeployMultipleWithSkip
=== PAUSE TestAccCloudflareRuleset_WAFManagedRulesetDeployMultipleWithSkip
=== RUN   TestAccCloudflareRuleset_WAFManagedRulesetDeployMultipleWithTopSkipAndLastSkip
=== PAUSE TestAccCloudflareRuleset_WAFManagedRulesetDeployMultipleWithTopSkipAndLastSkip
=== RUN   TestAccCloudflareRuleset_SkipPhaseAndProducts
=== PAUSE TestAccCloudflareRuleset_SkipPhaseAndProducts
=== RUN   TestAccCloudflareRuleset_WAFManagedRulesetWithCategoryAndRuleBasedOverrides
=== PAUSE TestAccCloudflareRuleset_WAFManagedRulesetWithCategoryAndRuleBasedOverrides
=== RUN   TestAccCloudflareRuleset_WAFManagedRulesetWithIDBasedOverrides
=== PAUSE TestAccCloudflareRuleset_WAFManagedRulesetWithIDBasedOverrides
=== RUN   TestAccCloudflareRuleset_MagicTransitUpdateWithHigherPriority
    provider_test.go:160: Skipping acceptance test as 0da42c8d2132a9ddaf714f9e7c920711 is not configured for Magic Transit
--- SKIP: TestAccCloudflareRuleset_MagicTransitUpdateWithHigherPriority (0.00s)
=== RUN   TestAccCloudflareRuleset_WAFManagedRulesetWithPayloadLogging
=== PAUSE TestAccCloudflareRuleset_WAFManagedRulesetWithPayloadLogging
=== RUN   TestAccCloudflareRuleset_RateLimit
=== PAUSE TestAccCloudflareRuleset_RateLimit
=== RUN   TestAccCloudflareRuleset_TransformationRuleURIPath
=== PAUSE TestAccCloudflareRuleset_TransformationRuleURIPath
=== RUN   TestAccCloudflareRuleset_TransformationRuleURIQuery
=== PAUSE TestAccCloudflareRuleset_TransformationRuleURIQuery
=== RUN   TestAccCloudflareRuleset_TransformHTTPResponseHeaders
=== PAUSE TestAccCloudflareRuleset_TransformHTTPResponseHeaders
=== RUN   TestAccCloudflareRuleset_TransformationRuleURIPathAndQueryCombination
=== PAUSE TestAccCloudflareRuleset_TransformationRuleURIPathAndQueryCombination
=== RUN   TestAccCloudflareRuleset_TransformationRuleRequestHeaders
=== PAUSE TestAccCloudflareRuleset_TransformationRuleRequestHeaders
=== RUN   TestAccCloudflareRuleset_TransformationRuleResponseHeaders
=== PAUSE TestAccCloudflareRuleset_TransformationRuleResponseHeaders
=== RUN   TestAccCloudflareRuleset_ActionParametersMultipleSkips
=== PAUSE TestAccCloudflareRuleset_ActionParametersMultipleSkips
=== RUN   TestAccCloudflareRuleset_ActionParametersOverridesAction
=== PAUSE TestAccCloudflareRuleset_ActionParametersOverridesAction
=== RUN   TestAccCloudflareRuleset_ActionParametersHTTPDDoSOverride
=== PAUSE TestAccCloudflareRuleset_ActionParametersHTTPDDoSOverride
=== RUN   TestAccCloudflareRuleset_AccountLevelCustomWAFRule
=== PAUSE TestAccCloudflareRuleset_AccountLevelCustomWAFRule
=== RUN   TestAccCloudflareRuleset_ExposedCredentialCheck
=== PAUSE TestAccCloudflareRuleset_ExposedCredentialCheck
=== RUN   TestAccCloudflareRuleset_ConditionallySetActionParameterVersion
=== PAUSE TestAccCloudflareRuleset_ConditionallySetActionParameterVersion
=== RUN   TestAccCloudflareRuleset_WAFManagedRulesetWithActionManagedChallenge
=== PAUSE TestAccCloudflareRuleset_WAFManagedRulesetWithActionManagedChallenge
=== CONT  TestAccCloudflareRuleset_WAFBasic
--- PASS: TestAccCloudflareRuleset_WAFBasic (15.95s)
=== CONT  TestAccCloudflareRuleset_TransformationRuleURIPath
--- PASS: TestAccCloudflareRuleset_TransformationRuleURIPath (12.20s)
=== CONT  TestAccCloudflareRuleset_WAFManagedRulesetWithActionManagedChallenge
--- PASS: TestAccCloudflareRuleset_WAFManagedRulesetWithActionManagedChallenge (23.00s)
=== CONT  TestAccCloudflareRuleset_ConditionallySetActionParameterVersion
--- PASS: TestAccCloudflareRuleset_ConditionallySetActionParameterVersion (20.06s)
=== CONT  TestAccCloudflareRuleset_ExposedCredentialCheck
--- PASS: TestAccCloudflareRuleset_ExposedCredentialCheck (11.64s)
=== CONT  TestAccCloudflareRuleset_AccountLevelCustomWAFRule
--- PASS: TestAccCloudflareRuleset_AccountLevelCustomWAFRule (13.65s)
=== CONT  TestAccCloudflareRuleset_ActionParametersHTTPDDoSOverride
--- PASS: TestAccCloudflareRuleset_ActionParametersHTTPDDoSOverride (11.85s)
=== CONT  TestAccCloudflareRuleset_ActionParametersOverridesAction
--- PASS: TestAccCloudflareRuleset_ActionParametersOverridesAction (11.71s)
=== CONT  TestAccCloudflareRuleset_ActionParametersMultipleSkips
--- PASS: TestAccCloudflareRuleset_ActionParametersMultipleSkips (12.35s)
=== CONT  TestAccCloudflareRuleset_TransformationRuleResponseHeaders
--- PASS: TestAccCloudflareRuleset_TransformationRuleResponseHeaders (12.29s)
=== CONT  TestAccCloudflareRuleset_TransformationRuleRequestHeaders
--- PASS: TestAccCloudflareRuleset_TransformationRuleRequestHeaders (11.76s)
=== CONT  TestAccCloudflareRuleset_TransformationRuleURIPathAndQueryCombination
--- PASS: TestAccCloudflareRuleset_TransformationRuleURIPathAndQueryCombination (11.49s)
=== CONT  TestAccCloudflareRuleset_TransformHTTPResponseHeaders
--- PASS: TestAccCloudflareRuleset_TransformHTTPResponseHeaders (10.75s)
=== CONT  TestAccCloudflareRuleset_TransformationRuleURIQuery
--- PASS: TestAccCloudflareRuleset_TransformationRuleURIQuery (13.00s)
=== CONT  TestAccCloudflareRuleset_WAFManagedRulesetDeployMultipleWithTopSkipAndLastSkip
--- PASS: TestAccCloudflareRuleset_WAFManagedRulesetDeployMultipleWithTopSkipAndLastSkip (14.40s)
=== CONT  TestAccCloudflareRuleset_RateLimit
--- PASS: TestAccCloudflareRuleset_RateLimit (12.00s)
=== CONT  TestAccCloudflareRuleset_WAFManagedRulesetWithPayloadLogging
--- PASS: TestAccCloudflareRuleset_WAFManagedRulesetWithPayloadLogging (11.75s)
=== CONT  TestAccCloudflareRuleset_WAFManagedRulesetWithIDBasedOverrides
--- PASS: TestAccCloudflareRuleset_WAFManagedRulesetWithIDBasedOverrides (13.14s)
=== CONT  TestAccCloudflareRuleset_WAFManagedRulesetWithCategoryAndRuleBasedOverrides
--- PASS: TestAccCloudflareRuleset_WAFManagedRulesetWithCategoryAndRuleBasedOverrides (12.45s)
=== CONT  TestAccCloudflareRuleset_SkipPhaseAndProducts
--- PASS: TestAccCloudflareRuleset_SkipPhaseAndProducts (12.48s)
=== CONT  TestAccCloudflareRuleset_WAFManagedRulesetOWASPOnlyPL1
--- PASS: TestAccCloudflareRuleset_WAFManagedRulesetOWASPOnlyPL1 (13.19s)
=== CONT  TestAccCloudflareRuleset_WAFManagedRulesetDeployMultipleWithSkip
--- PASS: TestAccCloudflareRuleset_WAFManagedRulesetDeployMultipleWithSkip (11.65s)
=== CONT  TestAccCloudflareRuleset_WAFManagedRulesetDeployMultiple
--- PASS: TestAccCloudflareRuleset_WAFManagedRulesetDeployMultiple (12.39s)
=== CONT  TestAccCloudflareRuleset_WAFManagedRulesetOWASP
--- PASS: TestAccCloudflareRuleset_WAFManagedRulesetOWASP (15.96s)
=== CONT  TestAccCloudflareRuleset_WAFManagedRulesetOWASPBlockXSSWithAnomalyOver60
--- PASS: TestAccCloudflareRuleset_WAFManagedRulesetOWASPBlockXSSWithAnomalyOver60 (12.75s)
=== CONT  TestAccCloudflareRuleset_WAFManagedRuleset
--- PASS: TestAccCloudflareRuleset_WAFManagedRuleset (12.19s)
PASS
ok  	github.com/cloudflare/terraform-provider-cloudflare/cloudflare	346.738s
?   	github.com/cloudflare/terraform-provider-cloudflare/tools/cmd/changelog-check	[no test files]
?   	github.com/cloudflare/terraform-provider-cloudflare/tools/cmd/maintainer-only-file-check	[no test files]
?   	github.com/cloudflare/terraform-provider-cloudflare/tools/cmd/tf-log-check	[no test files]
?   	github.com/cloudflare/terraform-provider-cloudflare/version	[no test files]