Remove bundle size check from pre-push hook (ampproject#19993)

* Skip check if no runtime files were touched

* Apply this to pre-push builds only

* Revert last 2 commits

* Straight up delete bundle size check from pre-push hook

build-system/default-pre-push

@@ -25,17 +25,12 @@
 GREEN() { echo -e "\033[0;32m$1\033[0m"; }
 CYAN() { echo -e "\033[0;36m$1\033[0m"; }
 
-GULP_BUNDLE_SIZE="gulp bundle-size"
 GULP_LINT_LOCAL="gulp lint --local-changes"
 GULP_TEST_LOCAL="gulp test --local-changes --headless"
 
 echo $(GREEN "Running") $(CYAN "pre-push") $(GREEN "hooks. (Run") $(CYAN "git push --no-verify") $(GREEN "to skip them.)")
 echo -e "\n"
 
-echo $(GREEN "Running") $(CYAN "$GULP_BUNDLE_SIZE")
-eval $GULP_BUNDLE_SIZE || exit 1
-echo -e "\n"
-
 echo $(GREEN "Running") $(CYAN "$GULP_LINT_LOCAL")
 eval $GULP_LINT_LOCAL || exit 1
 echo -e "\n"