build: run formatting automatically on pre-commit hook (angular#38402)

Runs the `ng-dev format changed` command whenever the `git commit` command is
run.  As all changes which are checked by CI will require this check passing, this
change can prevent needless roundtrips to correct lint/formatting errors. This
automatic formatting can be bypassed with the `--no-verify` flag on the `git commit`
command.

PR Close angular#38402

Author: josephperrott

package.json

@@ -209,6 +209,7 @@
   "cldr-data-coverage": "full",
   "husky": {
     "hooks": {
+      "pre-commit": "yarn -s ng-dev format staged",
       "commit-msg": "yarn -s ng-dev commit-message pre-commit-validate --file-env-variable HUSKY_GIT_PARAMS"
     }
   }