test: add tests for Gitea comment operations

[jaysomani]

• Implement testCreateComment with PR creation and verification
• Implement testUpdateComment with comment modification flow
• Add try/finally cleanup to prevent test repository leaks
• Remove skipped test markers for createComment and updateComment

[greptile-apps]

Greptile Summary

This PR implements testCreateComment and testUpdateComment for the Gitea adapter by replacing markTestSkipped stubs with full test flows: creating a temporary repository, branching, filing a PR, exercising the comment API, and cleaning up via try/finally.

• Both tests correctly exercise the full comment lifecycle (create → verify → update → verify) and assert on the returned comment ID type and content.
• createRepository is called outside the try/finally block in both new tests. While there is currently no code between that call and the try block (making it functionally safe), the pattern is fragile — any future addition in that gap would leak the repository on failure. Moving createRepository inside try is the safer approach.
• assertNotEmpty($commentId) in testCreateComment relies on PHP's empty() semantics, which considers the string '0' as empty. Although Gitea comment IDs are unlikely to be 0 in practice, assertNotEquals('', $commentId) would be a more precise assertion.
• The two new tests share nearly identical setup code (repo creation, file, branch, PR); extracting this into a private helper method would reduce duplication and make future test additions easier.

Confidence Score: 4/5

• Safe to merge — the tests are functionally correct and the issues are minor defensive/style concerns.
• The new tests implement the intended behaviour correctly, use proper try/finally cleanup, and assert on meaningful values. The only concerns are: createRepository sitting outside the try block (no code gap today, but fragile for future edits) and assertNotEmpty's falsy-string edge case with '0'. Neither is a runtime bug in the current state.
• No files require special attention.

Important Files Changed

Filename	Overview
tests/VCS/Adapter/GiteaTest.php	Implements testCreateComment and testUpdateComment with full PR lifecycle setup and try/finally cleanup; minor issues with createRepository placement outside the try block and assertNotEmpty's falsy-string sensitivity.

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