Add a way to clean up userEvent after a test

[brynshanahan]

Problem description

Introducing testing-library/user-event into a single test has started causing some unrelated tests to fail in another part of the codebase (tests dealing with focus specifically)

Suggested solution

It would be great if I could call userEvent.setup() in my test and then have a user.destroy() or userEvent.destroy() method to call after the test is complete

Additional context

No response