[Flow202][web][skip-ci] [7/x] Fix Flow issues with React hooks being underconstrained
Summary:
The new version of Flow is requiring declarations to provide explicit type params when Flow isn't able to infer them.
This diff adds those declarations for React.useRef and React.useState calls.
NOTE: CI will fail on this diff. I considered the possibility of fixing Flow errors BEFORE upgrading Flow, but it wasn't possible... in some cases, the fixes to support the new version of Flow caused errors in the old version. I could have hidden these type errors with $FlowFixMe lines and then later revert those, but that seemed like too much busy work.
Depends on D9772
Test Plan: Confirm the Flow errors go away
Reviewers: atul
Reviewed By: atul
Subscribers: tomek, wyilio
Differential Revision: https://phab.comm.dev/D9773