Align with latest changes in arm core

[ArcturusZhang]

Description

Align the code generator with recent changes in Azure.ResourceManager.Core

Checklist

To ensure a quick review and merge, please ensure:

• The PR has a understandable title and description explaining the why and what.
• The PR is opened in draft if not ready for review yet.
  • If opened in draft, please allocate sufficient time (24 hours) after moving out of draft for review
• The branch is recent enough to not have merge conflicts upon creation.

Ready to Land?

• Build is completely green
  • Submissions with test failures require tracking issue and approval of a CODEOWNER
• At least one +1 review by a CODEOWNER
• All -1 reviews are confirmed resolved by the reviewer
  • Override/Marking reviews stale must be discussed with CODEOWNERS first

[chamons]

Very few code changes, almost all csproj. Here's the tl-dr diff - https://gist.github.com/chamons/c3fc5020b4f8a404c681676953c9be02

Approved from a shared code angle.

[isra-fel]

Closing this in favor of #1302