Fix: Improve GCS Action error handling and logging

[jeffrey-martinez]

• Prevent 'undefined' error messages by stringifying the error object if message is missing.
• Log the full original error object for better debugging visibility.

[gemini-code-assist]

Summary of Changes

Hello @jeffrey-martinez, 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 significantly improves the error handling and logging within the Google Cloud Storage (GCS) action. The changes ensure that error messages are always informative, even when the original error object lacks a message property, and provide richer debugging information by logging the complete original error object. This leads to more reliable error reporting and easier troubleshooting.

Highlights

• Robust Error Message Generation: Implemented logic to prevent 'undefined' error messages by attempting to stringify the error object if its message property is missing, falling back to 'Unknown Error' if stringification also fails.
• Enhanced Debugging Visibility: The full original error object is now included in the winston.error logs, providing more comprehensive context for debugging.

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[gemini-code-assist]

Code Review

This pull request improves error handling and logging for the Google Cloud Storage action. The changes ensure that error messages are always defined and that the original error object is logged for better debugging. I've found a potential critical issue in the new error handling logic where it could crash if the caught error is null or undefined. I've provided a suggestion to make the error message generation more robust and prevent this crash.