azurerm_policy_set_definition - migrate to go-azure-sdk and split into 2 resources

[sreallymatt]

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Description

This PR migrates azurerm_policy_set_definition to go-azure-sdk and deprecates management_group_id in favour of a new resource azurerm_management_group_policy_set_definition since there are distinct operations and IDs for a policy set definition defined at a management group level.

The state migration added to azurerm_policy_set_definition is out of an abundance of caution, since the previous resource ID was parsed insensitively and users could have an ID with lowercased static segments, this state migration won't apply until 5.0 has been released.

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.
• I have updated/added Documentation as required written in a helpful and kind way to assist users that may be unfamiliar with the resource / data source.
• I have used a meaningful PR title to help maintainers and other users understand this change and help prevent duplicate work.
  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

Changes to existing Resource / Data Source

• I have added an explanation of what my changes do and why I'd like you to include them (This may be covered by linking to an issue above, but may benefit from additional explanation).
• I have written new tests for my resource or datasource changes & updated any relevant documentation.
• I have successfully run tests with my changes locally. If not, please provide details on testing challenges that prevented you running the tests.
• (For changes that include a state migration only). I have manually tested the migration path between relevant versions of the provider.

Testing

• My submission includes Test coverage as described in the Contribution Guide and the tests pass. (if this is not possible for any reason, please include details of why you did or could not add test coverage)

4.0 testing:

5.0 testing:

Change Log

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

• azurerm_resource - support for the thing1 property [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 #0000

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.

[mbfrahry]

Hey @sreallymatt, this looks great but I think we should add just a little more context to the // BEGIN TODO comment

[mbfrahry]

LGTM! Thanks for that

[github-actions]

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