fix: Use pull request number from issue comment payload

[zakisk]

this uses the pull request number from issue commnet payload instead of doing hack to getting the number from pull request URL.

📝 Description of the Change

🔗 Linked GitHub Issue

Fixes #

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[gemini-code-assist]

Code Review

This pull request refactors the handling of pull request numbers by extracting them directly from GitHub events instead of parsing them from HTML URLs. The changes include updating the event structure to store the pull request number, removing the now-obsolete convertPullRequestURLtoNumber utility function and its associated import, and updating the test suite to reflect these structural changes. I have no feedback to provide.