Investigate React 18 testing solution for v8 controls

[behowell]

Fluent v8 uses Enzyme for testing most control and Enzyme is incompatible with React 18 meaning we're unable to test all Fluent UI v8 controls in React 18.

We have migrated some test cases to testing-library which supports React 18, however not all controls have been migrated.

We are currently unable to reliably address React 18 bugs in Fluent UI v8 since we cannot run our test suite against this version of React.

Investigate ways in which we can support testing Fluent UI v8 against React 18+. Some options:

1. Update Enzyme to support React 18
2. Continue migration to testing-library
3. Something else?

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