Preemption_policy attribute

[sheneska]

Description

This PR adds the preemption_policy attribute to kubernetes_priority_class resource

Acceptance tests

• Have you added an acceptance test for the functionality being added?
• Have you run the acceptance tests on this branch?

Fixes #1299

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

Release Note

Release note for CHANGELOG:

...

References

Community Note

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[jrhouston]

Thanks for adding this @sheneska! You'll need to:

• Update the markdown documentation page to add this attribute
• Add a changelog entry for this change. You can do this by running make changelog-entry at the top level of the repo. You might need to install go-changelog with this command:

go install github.com/hashicorp/go-changelog/cmd/changelog-entry@latest

[github-actions]

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