lint: enable reportUnusedDisableDirectives and remove unused suppressions (#28721)

This enables linting against unused suppressions and removes the ones
that were unused.

scripts/babel/transform-react-version-pragma.js

@@ -1,7 +1,5 @@
 'use strict';
 
-/* eslint-disable no-for-of-loops/no-for-of-loops */
-
 const getComments = require('./getComments');
 
 const GATE_VERSION_STR = '@reactVersion ';