fix(backend): Improve GitHub PR URL validation and API URL generation

[seer-by-sentry]

Changes 🏗️

Fixes AUTOGPT-SERVER-4EN. The issue was that: Issue URL passed to PR file reader, regex failed, leading to issue API call, returning object iterated as keys, causing AttributeError.

• Refactor prepare_pr_api_url to improve validation of GitHub PR URLs.
• Update regex to specifically target github.com URLs.
• Raise ValueError with a descriptive message for invalid URLs.
• Correctly construct the API URL using the extracted repository path.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 265077

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Checklist 📋

For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
• I have tested my changes according to the test plan:
  • Test plan:
    • Provide an invalid GitHub PR URL and verify that a ValueError is raised with a descriptive message.
    • Provide a valid GitHub PR URL and verify that the API URL is correctly constructed.

For configuration changes:

• .env.example is updated or already compatible with my changes
• docker-compose.yml is updated or already compatible with my changes
• I have included a list of my configuration changes in the PR description (under Changes)

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[deepsource-io]

Here's the code health analysis summary for commits 07461a8..603b398. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success		View Check ↗
Python	✅ Success		View Check ↗

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[AutoGPT-Agent]

Thank you for this fix! The changes to improve GitHub PR URL validation look good.

However, I noticed that you haven't completed the checklist in your PR description:

• You've described a test plan but haven't checked off the items indicating that you've run these tests
• The "I have made a test plan" checkbox is also not checked

Could you please:

1. Run the tests according to your test plan
2. Check off all the items in your test plan once verified
3. Check the "I have made a test plan" checkbox

I see you've added a test_fix.py file which includes test cases - have you run these tests to verify the fix? If so, please update the checklist to reflect this.

Once the checklist is complete, this PR should be ready to merge.