fix(backend): Fix Github PR blocks

[vishesh10]

Background

The Github PR blocks are not able to function properly because the correct endpoint is not getting called.

• Resolves GitHub Read PR block with "Include PR Changes" fails #8667

Changes 🏗️

• Added logic to derive correct endpoint from the given PR url.
• This logic is implemented in multiple blocks viz. GithubReadPullRequestBlock, GithubAssignPRReviewerBlock, GithubUnassignPRReviewerBlock, GithubListPRReviewersBlock.

Test

• Github List PR Reviewers

• Github Read Pull Request (Include Pr Changes checked)

[CLAassistant]

All committers have signed the CLA.

[github-actions]

This PR targets the master branch but does not come from dev or a hotfix/* branch.

Automatically setting the base branch to dev.

[qodo-merge-pro]

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ 8667 - Fully compliant Compliant requirements: Fixed URL conversion logic by implementing prepare_pr_api_url function Corrected API endpoint format to use 'pulls' instead of 'pull'

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Error Handling The regex pattern in prepare_pr_api_url function might be too strict and could fail for valid GitHub URLs with different formats Code Smell The error message in prepare_pr_api_url is not descriptive enough and doesn't help diagnose what's wrong with the URL

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[majdyz]

Comment addressed and approved