Add Tests for PR#1285

[codecov-ai]

This PR adds tests for #1285

Commits:

• Add tests for GitHub webhook handler AI PR review functionality

This commit adds unit tests for the new GitHub webhook handler functionality:

• Test for handling pull requests with HOOK_INSTALLATION_TARGET_ID header
• Test for check_codecov_ai_auto_enabled_reviews method with various configurations
• Fixed duplicate test_repo_creation_doesnt_crash_for_forked_repo method

[sentry-autofix]

🚨 Sentry detected 4 potential issues in your recent changes 🚨

Lower risk findings

• Line 410, webhook_handlers/views/github.py

  • Potential KeyError if request.data["repository"]["owner"]["id"] does not exist.

• Line 366, webhook_handlers/views/github.py

  • AI_FEATURES_GH_APP_ID might be None, causing potential errors.

• Line 368, webhook_handlers/views/github.py: Function is missing a type annotation

  • Missing type annotation for pull_request method can lead to unexpected behavior.

• Line 408, webhook_handlers/views/github.py: Function is missing a type annotation

  • Missing type annotation for check_codecov_ai_auto_enabled_reviews method can lead to unexpected behavior.

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