AFAIK with the build-script upgrades we have done - this monkeypatch is
no longer necessary. The build size still seems to be the same.

This should speed up builds in CI, and must not have gotten caught when
upgrading `react-scripts`.
ref: arackaf/customize-cra#278

This way formatting issues won’t prevent the preview from building (and
it should build a bit faster due to not having to run ESLint).