[AIR-3024] qs: merge Unstash and PopStashedFiles

[host6]

AIR-3024 qs: merge Unstash and PopStashedFiles
https://untill.atlassian.net/browse/AIR-3024

[augmentcode]

🤖 Augment PR Summary

Summary: This PR consolidates stash-pop behavior into a single Unstash() helper.

Changes:

• Removed the dedicated stash-existence helper and the separate PopStashedFiles() function.
• Updated Unstash() to first run git stash list and only git stash pop when entries exist.
• Kept Stash() as the single entry point for stashing uncommitted changes.
• Updated the fork workflow to call gitcmds.Unstash(wd) instead of PopStashedFiles.
• Added an archived implementation note documenting the refactor.

Technical Notes: The new Unstash() avoids invoking stash pop when there are no stashes, reducing spurious errors in workflows that conditionally stash.

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[augmentcode]

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