[core] Use act from react

[LukasTy]

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[mui-bot]

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[cherniavskii]

@LukasTy Why did you close it? It's blocking mui/mui-x#12295

[cherniavskii]

@LukasTy Nevermind, I guess it's because #42447 removes the createMount altogether 👍🏻

[LukasTy]

Nevermind, I guess it's because #42447 removes the createMount altogether 👍🏻

@cherniavskii You are correct. That was my exploration trying to keep the tests as is, but replacing enzyme with other imports.
It proved too problematic. 🙈

[LukasTy]

@DiegoAndai is createMount here to stay for the remaining tests in material-ui?
Maybe in that case this PR makes sense? 🤔

[aarongarciah]

@LukasTy we're working on removing createMount.

[LukasTy]

Thanks for the clarification @aarongarciah. 👍

[aarongarciah]

And I think we'll update all act and other imports in #42047

[aarongarciah]

@LukasTy since we're trying to remove createMount, is that ok for the X team or do you prefer that we keep it as deprecated?

[LukasTy]

@aarongarciah We are not using it anywhere, no objections to removing it. 👍