Enforce non-empty metadata keys in forms #9650
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Closes #5251
Change Description
Background
The UI for adding metadata fields allowed empty key-value pairs to be added. This is different from the CLI behaviour which filters them. While we plan to add server-side validation to forbid empty metadata keys in a future update, for now, we want to provide client-side validation to give immediate user feedback and avoid unnecessary API calls that would fail validation.
Bug Fix
Add client-side validation to prevent form submission (commit, merge, import) when metadata keys are empty or whitespace-only.
Fields are marked as invalid when:
Invalid fields display "Key is required" error message.
Testing Details
Added component tests using React Testing Library to verify validation behaviour.
Also performed manual testing to verify behaviour when interacting with many fields.