*: suppress git mirror refresh output by default

[adityamaru]

Summary

Only show progress and verbose output when the verbose input is explicitly enabled. This reduces noise in logs for customers who don't need detailed git mirror debugging information.

Changes

• Remove --progress flag from default git fetch args
• Only add --progress and --verbose flags when verbose=true
• Add silent: !verbose to suppress stdout/stderr when not in verbose mode

Testing

All existing tests pass. The change is backward compatible—existing workflows with verbose=true will continue to see full output.

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Note

Low Risk
Small change to logging/exec options around git fetch; main risk is reduced diagnostic output if silent behavior differs across environments, mitigated by including stderr in errors.

Overview
Suppresses mirror refresh log noise by removing default --progress from git fetch and running the fetch in silent mode unless verbose=true.

When not verbose, failures now surface more useful details by appending trimmed stderr to the thrown git fetch failed error message (so the post-step logs still explain why the refresh failed).

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