Add tool mcp_ado_repo_get_pull_request_changes

[posidron]

Replace by description of the work done

GitHub issue number

Associated Risks

Replace by possible risks this pull request can bring you might have thought of

✅ PR Checklist

• I have read the contribution guidelines
• I have read the code of conduct guidelines
• Title of the pull request is clear and informative.
• 👌 Code hygiene
• 🔭 Telemetry added, updated, or N/A
• 📄 Documentation added, updated, or N/A
• 🛡️ Automated tests added, or N/A

🧪 How did you test it?

Replace with use cases tested and models used

[codecov-commenter]

Codecov Report

❌ Patch coverage is 79.74684% with 16 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@60b10ee). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/tools/repositories.ts	79.74%	3 Missing and 13 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #801   +/-   ##
=======================================
  Coverage        ?   93.37%           
=======================================
  Files           ?       16           
  Lines           ?     1569           
  Branches        ?      340           
=======================================
  Hits            ?     1465           
  Misses          ?       22           
  Partials        ?       82           

Flag	Coverage Δ
unittests	93.37% <79.74%> (?)

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