feat: [PIPE-28869]: Added support for pull_request_review

[shivamnegi94]

Changes

• Added support for GitHub pull request review webhooks
• Added test data and golden files for both GitHub and GitLab
• Updated webhook parsing logic to handle review events

Testing

• Added test cases for GitHub review webhooks
• Verified webhook parsing and conversion
• Ensured backward compatibility with existing webhook handlers

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[abhinav-harness]

can we keep up with the rule -- add it for atleast 3 providers?

[shivamnegi94]

can we keep up with the rule -- add it for atleast 3 providers?

I’ve checked this for other Git providers, and currently, it’s only supported in GitHub. For the others, the comment event is used instead, which is already implemented.