azurerm_postgresql_flexible_server - Support versionless CMK key vault key id

[magodo]

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Description

The azurerm_postgresql_flexible_server CMK key vault key id didn't support versionless id (see: #28981), but now it supports: https://techcommunity.microsoft.com/blog/adforpostgresql/new-versionless-cmk-in-azure-database-for-postgresql/4406743.

This PR adds that support back to azurerm_postgresql_flexible_server.

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
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Testing

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💤  TF_ACC=1 go test -v -timeout=20h -parallel=20 -run='TestAccPostgresqlFlexibleServer_createWithCustomerManagedKey' ./internal/services/postgres
=== RUN   TestAccPostgresqlFlexibleServer_createWithCustomerManagedKey
=== PAUSE TestAccPostgresqlFlexibleServer_createWithCustomerManagedKey
=== RUN   TestAccPostgresqlFlexibleServer_createWithCustomerManagedKeyVersionless
=== PAUSE TestAccPostgresqlFlexibleServer_createWithCustomerManagedKeyVersionless
=== CONT  TestAccPostgresqlFlexibleServer_createWithCustomerManagedKey
=== CONT  TestAccPostgresqlFlexibleServer_createWithCustomerManagedKeyVersionless
--- PASS: TestAccPostgresqlFlexibleServer_createWithCustomerManagedKeyVersionless (687.47s)
--- PASS: TestAccPostgresqlFlexibleServer_createWithCustomerManagedKey (696.92s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/postgres      696.972s

Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• azurerm_postgresql_flexible_server - Support versionless CMK key vault key id [GH-00000]

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #29159

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the provider.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[sreallymatt]

Thanks @magodo, LGTM ✅

[github-actions]

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