[core] Bump React to 18.3.1

[aarongarciah]

Contents of this PR:

• Cherry-pick of [core] Bump React to 18.3.1 #42047
• Bump of @testing-library/react and @testing-library/dom. As of React 18.3.1 act is no longer exported from react-dom/test-utils and is now exported from react. Older versions of @testing-library/react point to act in react-dom/test-utils, so we need to upgrade to a newer version. This can't be done in a separate PR because of some incompatible types.

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We're backporting all changes to support React 18.3.1 from next to master. These are the changes to backport from next before we can merge this PR:

• [core] Replace enzyme in describeConformance #42847 (original PR)
• [test] Remove createMount test util #42849 (original PR)
• [test] Remove enzyme #42850 (original PR)
• [core] Remove react-test-renderer #42853 (original PR)
• [styles][withStyles] Expect React defaultProps warning in test (#42752) #42851 (original PR)
• [material-ui][docs] Fix type error in virtualized table demo #42852 (original PR)
• [mui-utils][test] Remove usages of deprecated react-dom APIs (@aarongarciah) #42813 (original PR)
• mui-joy/Input.tsx proptypes TS issue. Included in this PR (see CI log).
• Update react-simple-code-editor to 0.14.1 to avoid defaultProptypes warning. Included in this PR.
• Fix spread key warnings
  • [material-ui][docs] Fix React 18.3 key spread warnings in Autocomplete demos #42854 (original PR)
  • [base-ui] Fix React spread key warning in test #42855 (original PR)
  • [joy-ui][Autocomplete] Fix React spread key warning #42856 (original PR)

[mui-bot]

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[aarongarciah]

Finally a bump of @testing-library/dom and @testing-library/react was required to have a compatible React 18.3.1 testing setup, otherwise tests would fail due to some wrong types.

[DiegoAndai]

🎉