[Feature]: add react 19 support to react-components

[Hotell]

Area

React Components (@fluentui/react-components)

Describe the feature that you would like added

This is an Epic to track react 19 support initiative for react-components (v9)

Tasks

• add jest tests to react-19-tests-v9 / PR
• add test-ssr to react-19-tests-v9
• run type-check integration against source files to mitigate "unexpected surprises" when migrating repo to R19
• all integration tests in react-19-tests-v9 are passing
  • e2e
  • unit
  • type-check / PR
  • ssr
• resolve React 19 types breaking changes in backwards compatible way
  • scoped jsx https://github.com/eps1lon/types-react-codemod?tab=readme-ov-file#scoped-jsx-react-19 / PR
  • ref object defaults https://github.com/eps1lon/types-react-codemod?tab=readme-ov-file#refobject-defaults-react-19
• migrate repo to react 19
  • check feasibility of migrating v8 code ( if not feasible -> we will need to nohoist and related things )

Additional context

• initial feature request [Feature]: Support for React 19 #33482
• related issues:
  • [Bug]: Menu control not appearing in NextJS / React 19 #31429
  • [Bug]: Tooltips of MenuItem is not showing when open menu button by keyboard #34296

Have you discussed this feature with our team

@microsoft/cxe-prg

Validations

• Check that there isn't already an issue that requests the same feature to avoid creating a duplicate.

Priority

High

[layershifter]

Dupe #33482? FYI there are also two major bugs #31429 & #34296

[Hotell]

not a dupe really, rather epic of work items