Static Classname Conformance Test Refactor

[spmonahan]

Consider refactoring the static class name tests from #21960 (see also #21847).

Possible updates:

1. For expectedClassnames only require the slot names, not the mapped slot: classname object. This is less code and slightly cleaner.
2. Consider removing the test the verifies that exported class names are in the correct format. This can be accomplished with (or similar)

export type SlotClassNames<Component, Slots> = {
  [SlotName in keyof Slots]-?: SlotName extends 'root'
    ? `fui-${string & Component}`
    : `fui-${string & Component}__${string & SlotName}`;
};

but requires the Template Literal Types feature from Typescript 4.1. react-components currently must support TS3.9.

Depends on

1. Port react-conformance tests to testing-library #22009
2. Rewrite react-conformance API to be more extensible/modular #21665

[msft-fluent-ui-bot]

Because this issue has not had activity for over 150 days, we're automatically closing it for house-keeping purposes.

Still require assistance? Please, create a new issue with up-to date details.

[msft-fluent-ui-bot]

Because this issue has not had activity for over 150 days, we're automatically closing it for house-keeping purposes.

Still require assistance? Please, create a new issue with up-to date details.