[Flow202][web][skip-ci] [6/x] Address type errors in community drawer code
Summary:
The new version of Flow revealed some type errors here. Submitting this as a separate diff to make sure the changes I made to correct the type errors are correct.
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 D9771
Test Plan: Confirm the Flow errors go away
Reviewers: inka
Reviewed By: inka
Subscribers: tomek, wyilio
Differential Revision: https://phab.comm.dev/D9772