Fix eslint disable frontend_integration fixtures

- This fixes an issue where some local environments
  with all fixtures generated will trigger an
  `Unused eslint-disable directive` error.

spec/frontend_integration/test_helpers/fixtures.js

-/* eslint-disable global-require, import/no-unresolved */
+/* eslint-disable global-require */
+// We use "require" rather than `fs` so that this works in a browser environment.
+
+/* eslint "import/no-unresolved": 0 */
+// We don't want to require *all* fixtures to be generated (especailly in a local environment).
+// We use `eslint` instead of `eslint-disable`, so that we also don't trigger an `Unused eslint-disable directive` when all fixtures are present.
+
 import { memoize } from 'lodash';
 
 const createFactoryWithDefault = (fn, defaultValue) => () => {