Chore: Add betterer test to track conversion of enzyme tests (#45055)

* Add betterer test for number of enzyme tests

* emit metric for number of enzyme tests

* update frontend metrics script

* Merge...

* Switch order of betterer/lint

* Update version of betterer

* kick levitate

* Update lockfile

.betterer.ts

@@ -0,0 +1,5 @@
+import { regexp } from '@betterer/regexp';
+
+export default {
+  'no enzyme tests': () => regexp(/from 'enzyme'/g).include('**/*.test.*')
+};