azurerm_postgresql_flexible_server - update validation for CMKs, versionless keys are not supported

[sreallymatt]

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Description

Passing a versionless key ID causes the deployment to fail with an unhelpful InternalServerError error message. When provisioning a postgresql flexible server resource in Azure portal the CMK ID field's validation states a version guid is required.

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
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  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

Changes to existing Resource / Data Source

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Testing

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Failed test was in post test destroy, failed to remove a subnet, unrelated to changes

Change Log

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

• azurerm_postgresql_flexible_server - fix customer_managed_key.key_vault_key_id and customer_managed_key.geo_backup_key_vault_key_id validation to prevent unclear error messages [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

Note

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

[mbfrahry]

LGTM

[github-actions]

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