Fix conditional stash pop in git hook script

[Copilot]

The scripts/test.sh git hook script was unconditionally popping the stash even when no stash was created, which could affect unrelated stashes or cause errors.

The issue occurred because:

• git stash push --keep-index only creates a stash when there are unstaged changes
• When no unstaged changes exist, the command outputs "No local changes to save" but succeeds
• The script would then unconditionally run git stash pop, potentially popping an unrelated stash

This fix captures the output of git stash push and only runs git stash pop when a stash was actually created (indicated by "Saved working directory" in the output).

Before:

run_cmd "git stash push --keep-index --message precommit"
# ... build steps ...
run_cmd "git stash pop"  # Always runs, even if no stash was created

After:

stash_output=$(git stash push --keep-index --message precommit 2>&1)
# ... check if stash was created ...
if [[ "${stash_created}" == true ]]; then
    run_cmd "git stash pop"  # Only runs when needed
fi

The fix maintains the same output formatting and user experience while making the script more robust.

Fixes #3225.

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[coveralls]

Pull Request Test Coverage Report for Build 17819161224

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 42.462%

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Totals
Change from base Build 17819137218:	0.0%
Covered Lines:	21065
Relevant Lines:	51962

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💛 - Coveralls

[heyzec]

For reference: https://stackoverflow.com/questions/52568548/git-stash-exits-0-but-no-stash-created

[heyzec]

I tested this and it works. Nits:

(1) Output when testing with git hook run pre-push

> git stash push --keep-index --message precommit
  Saved working directory and index state On copilot/fix-3225: precommit
  If you cancel this pre-push hook, use `git stash pop` to retrieve your
  unstaged changes.

Ideally I'd prefer if Saved working directory and index state On copilot/fix-3225: precommit message is hidden (the output of this git command was not shown before this PR)

(2) Script

    stash_output=$(git stash push --keep-index --message precommit 2>&1)
    echo_cyan "> git stash push --keep-index --message precommit"

Would be nice if it was not duplicated