add a stash/pop to the tidy pre-push git-hook

added error handling for git stash and apply

fix tidy err

abort if stash push fails

fix tidy errors... again

Author: simp4t7

src/etc/pre-push.sh

@@ -29,7 +29,9 @@ cd "$ROOT_DIR"
 # The env var is necessary for printing diffs in py (fmt/lint) and cpp.
 TIDY_PRINT_DIFF=1 ./x test tidy \
     --set build.locked-deps=true \
+    --pre-push \
     --extra-checks auto:py,auto:cpp,auto:js
+
 if [ $? -ne 0 ]; then
     echo "You may use \`git push --no-verify\` to skip this check."
     exit 1