Fix usgov support for communication services

[MichaelChristopherson]

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Description

This PR is resolving this issue here: #23719. The usgov region now supports these resources and is currently only being stopped by the text reference validation.

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.

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 relevent documentation.
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• (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)
• (In progress) - Tested if I can create these resources manually

Change Log

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

• azurerm_communication_service - support for usgov region added
• azurerm_email_communication_service - support for usgov region added

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 #23719

[MichaelChristopherson]

Tested manually deploying a azurerm_communication_service into my usgov instance and was successfully able to do so.

[katbyte]

Thanks @MichaelChristopherson - LGTM 📆

[github-actions]

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