Add Azure/typespec-azure integration check to PR CI workflow

[Copilot]

This PR adds an optional CI check that verifies changes to the TypeSpec repository are compatible with the Azure/typespec-azure repository.

What's been implemented

• New GitHub workflow (typespec-azure-integration-check.yml) that:

  • Clones the Azure/typespec-azure repository
  • Automatically detects the "core" submodule in that repo
  • Updates the submodule to point to the current PR's commit
  • Runs build and tests to verify compatibility
  • Includes comprehensive logging and error handling

• Added documentation in .github/workflows/README.md explaining how the workflow operates

Why this is useful

This check helps developers identify early if their changes to microsoft/typespec would break the Azure/typespec-azure repository, which depends on TypeSpec as a core dependency. It proactively prevents integration issues between the two repositories.

Technical details

• Only runs on Linux with Node LTS as specified in requirements
• Finds the TypeSpec submodule dynamically, handling different possible repository structures
• Provides detailed logs with proper step grouping for easy debugging
• Optional check that won't block PR merges

Fixes #5058.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• cdn.fwupd.org
  • Triggering command: /usr/bin/fwupdmgr refresh (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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[github-actions]

No changes needing a change description found.

[chrisradek]

Final results look great!