internal: make release to chdir before looking for version markers

[rickeylev]

The release tool wasn't determining the next version correctly because it was
in the wrong directory when that logic ran. To fix, chdir before that logic kicks off.

[gemini-code-assist]

Summary of Changes

Hello @rickeylev, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical bug in the internal release tool where it failed to correctly determine the next release version due to an incorrect working directory context. The fix involves reordering a directory change operation to ensure the versioning logic executes from the correct workspace root. Additionally, comprehensive unit tests have been introduced to validate the determine_next_version function's behavior under various conditions, significantly improving the robustness of the release process.

Highlights

• Fix Release Versioning: The internal release tool now correctly determines the next version by ensuring the working directory is set to the workspace root before the version determination logic is executed. This resolves an issue where the tool was operating from an incorrect directory.
• Improved Test Coverage: New unit tests have been added for the determine_next_version function, covering various scenarios such as the absence of version markers, the presence of only patch markers, only feature markers, and both types of markers. These tests ensure the versioning logic behaves as expected.

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[gemini-code-assist]

Code Review

This pull request correctly addresses a bug in the release tool where the working directory was changed too late, causing an incorrect version determination. Moving the os.chdir call to the beginning of the main function is the right solution, ensuring that all subsequent operations run from the correct workspace root. The addition of the DetermineNextVersionTest class with its comprehensive test cases is excellent; it thoroughly validates the versioning logic under various conditions and improves the overall robustness of the script. The changes are well-implemented and the new tests provide great coverage.