Created by: tobiasbueschel
This PR is a follow-up from: https://github.com/facebook/create-react-app/pull/9473#discussion_r468993013
I've had a few situations where it would have been helpful to have the testPathIgnorePatterns as an override option - a few users on StackOverflow also ran into the same: https://stackoverflow.com/a/55634512/5237070).