DrDroid AI: Fix: Log GitHub 403 errors as info instead of error

[doctor-droid-app]

Summary

GitHub API 403 responses (token lacks permission to access private repos) are now logged as info instead of error, preventing unnecessary Sentry noise.

Changes

• Updated get_pr_files to use logger.info for 403 responses
• Updated get_pr_comments (both issue and review comment fetches) to use logger.info for 403 responses
• Updated list_recent_commits, get_commit_files, get_commit_comments, list_pull_requests, get_pull_request, list_releases, get_release, and get_repository_info to use logger.info for 403 responses
• All other non-200 status codes continue to use logger.error as before

Testing

• Verified the conditional logic checks for status code 403 specifically and routes to logger.info, while all other error status codes continue to use logger.error

This PR is created as part of investigation https://aiops.drdroid.io/?investigation_id=8e590cf3-af9d-4e6c-8dc8-0e99202e1a86