Fix import failures on old teams locations

[dfialho]

Recently a change was made to teams locations
which adds the "endpoints" field. However, old
locations still don't have that field.

The provider was failing to read these old
locations because it was assuming the field was
there. This was fixed by excluding this field
when not available.

It is not possible to have an integration test for
this now because accounts are not created like
this anymore.

Tested using one of these old accounts: b0b145b6eff5790e74510592c26492cd/6543045645ad4591a4dd9ce3f7cea626

{"id":"6543045645ad4591a4dd9ce3f7cea626","name":"Home","networks":[{"network":"86.20.102.184/32"}],"ip":"2a06:98c1:54::1:d9bb","doh_subdomain":"jjezp4o172","anonymized_logs_enabled":false,"ipv4_destination":"172.64.36.1","ipv4_destination_backup":"172.64.36.2","dns_destination_ips_id":"0e4a32c6-6fb8-4858-9296-98f51631e8e6","client_default":true,"ecs_support":false,"dns_destination_ipv6_block_id":null,"created_at":"2022-04-06T13:23:52Z","updated_at":"2024-03-27T10:13:16Z"}

Closes #4846

[github-actions]

changelog detected ✅

[jacobbednarz]

acceptance tests all passing

TF_ACC=1 go test ./internal/sdkv2provider -v -run "^TestAccCloudflareTeamsLocation" -count 1 -timeout 120m -parallel 1
=== RUN   TestAccCloudflareTeamsLocationBasic
--- PASS: TestAccCloudflareTeamsLocationBasic (3.33s)
PASS
ok      github.com/cloudflare/terraform-provider-cloudflare/internal/sdkv2provider      5.684s

[github-actions]

This functionality has been released in v4.51.0 of the Terraform Cloudflare Provider.

Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!