[native] Remove renderSearch in ChatThreadList and inline ChatThreadListSearch directly
Instead of passing a function to create ChatThreadListSearch we can inline the component directly.
As part of this we also replace additionalProps w/ more precise innerSearchAutoFocus and innerSearchActive props.
Depends on D9207
Test Plan: Search experience continues to look and work as expected. Set logs in all expected callbacks to ensure that they fired as expected. Made sure that x-icon and "Cancel" button continue to look and behave as before.
Reviewers: ginsu, tomek, rohan
Reviewed By: tomek
Differential Revision: https://phab.comm.dev/D9208