Added support of markdown for work item comments

[egor-bryzgalov]

Added support of markdown for work item comments.
Add work item comments API reference

GitHub issue number

#66

Associated Risks

None

✅ 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?

Tested with Claude Sonnet 4.
Tried adding comments containing markdown or HTML content or just a plain text. It successfully uses the format parameter in most of the cases.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@a1e04a7). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/tools/workitems.ts	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #285   +/-   ##
=======================================
  Coverage        ?   98.12%           
=======================================
  Files           ?       10           
  Lines           ?      480           
  Branches        ?       60           
=======================================
  Hits            ?      471           
  Misses          ?        3           
  Partials        ?        6           

Flag	Coverage Δ
unittests	98.12% <80.00%> (?)

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[danhellem]

This looks good to me but would like to have someone else on the team review as well