Add logging when git lfs push --dry-run returns empty output

[Copilot]

Addresses code review feedback to improve debuggability when GetAllLfsFiles returns an empty map.

Changes

• Added log message when dry-run output is empty to distinguish "no LFS files to push" from error conditions
• Removed unnecessary string conversion (out is already string from RunLfsPushDryRun)

out, err := RunLfsPushDryRun(ctx, repoDir, spec, logger)
if err != nil {
    return nil, err
}

// Log when dry-run returns no output to help with debugging
if strings.TrimSpace(out) == "" {
    logger.Printf("No LFS files to push (dry-run returned no output)")
}

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[Copilot]

Pull request overview

This PR adds a logging statement to improve debuggability when GetAllLfsFiles encounters an empty dry-run output from git lfs push.

Key changes:

• Added informational log message when git lfs push --dry-run returns no output, helping distinguish between "no LFS files to push" and error conditions

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