Add new modules for MGs & Subscription Alias with targetScope = MG (Non-Breaking)

[jtracey93]

Overview/Summary

AB#31228

Add new modules for MGs & Subscription Alias with targetScope = MG (Non-Breaking).

The reason for new modules instead of updating existing ones is to not make this a breaking change 👍

Also added flexibility to accelerator pipeline PowerShell script for MG deployment, but further work will need to be done to accelerator logic to take advantage of - @oZakari FYI

This PR fixes/adds/changes/removes

1. Fixes [Least Privilege] - Add support for creating subscriptions and management groups without needing tenant root permissions #643
2. Fixes Deploy MG hierarchy to non-tenant root MG - parTopLevelManagementGroupParentId issues #650

Breaking Changes

None

Testing Evidence

As part of this Pull Request I have

• Read the Contribution Guide and ensured this PR is compliant with the guide
• Ensured the resource API versions in .bicep file/s I am adding/editing are using the latest API version possible
• Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues
• (ALZ Bicep Core Team Only) Associated it with relevant ADO Items
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Performed testing and provided evidence.
• Updated one or more of the following tests (if required)
  • Unit
  • Linting
  • E2E (End-To-End)
  • ValidateAzCloud (Base validation in Azure Cloud)
  • ValidateMcCloud (Base validation in Azure China Cloud)
• Updated relevant and associated documentation (e.g. Contribution Guide, Module READMEs, Wiki Docs etc.)
• If relevant, created or updated Code Tours here

[jtracey93]

/azp run validateazcloud

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[oZakari]

Looks good!