Rewrite react-conformance API to be more extensible/modular

[ecraig12345]

The API of @fluentui/react-conformance was designed with the intent of being extensible, but it's not a very good design. Also, it has the issue today of including tests in the core package that are actually specific to v8/v9/v0 (which can cause dependency graph issues and is generally unhelpful) and introducing enzyme+node types into the global namespace anywhere it's imported.

The new API will probably look something like this, inspired by babel:

isConformant({
  componentPath: '',
  presets: [
    // these will probably support a standard 'exclude' argument to disable rules
    basePreset({ /* strictly typed config options */ }),
    griffelPreset(),
  ],
  // possibly also 'plugins'/'rules' but this could maybe be combined with presets
})

This will be a breaking change to the conformance package. To help stage it, we may temporarily stop publishing the package (allowing all the breaking changes to be released together when ready). react-conformance is still 0.x, meaning we can break things in minors. We might release 1.0 once the refactor is done.

Conversion from enzyme to testing-library (#21663) will probably be done at the same time since it affects the public API.

Work items

• Move northstar-specific conformance tests back to northstar #21700 - reducing amount of complex old logic that needs to be ported
• Port react-conformance tests to testing-library #22009 - could have been done either before or after refactoring, but nice to get it out of the way (also to get rid of global leakage from enzyme)
• simplify error message handling?
• figure out new API and implement types
• port all tests to new API
• release 1.0
• other/sub items...? TBD

Related items

• Improve perf for typing-related conformance tests #19697

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