Migrate to using @testing-library/user-event

[artursvonda]

The userEvent better represents actions taken by user/browser and actually allows us to get rid of some hacks.

Also, testing now with React v18.

And removed redundant act calls as well since, both, fireEvent and userEvent wrap calls in act implicitly (when required).

[aroslaniec]

Love to see this change as it also solves issue with act() wrapping fireEvent() in rse.clear() method that throws RTL warnings - your change seams to be working fine w/o that issue

[kirkobyte]

I've tested these changes locally on a large codebase I'm migrating to React 18 and can confirm it's fixed bugs which arose from the migration

[chiptus]

@romgain do you think this can be merged and published to npm?