[web] Update a tooltip when it changes

Summary:
Every time a tooltip is changed, render an updated version using the api introduced in this stack.

Depends on D6087

Test Plan: Tested a couple of scenarios including copying a message and then e.g. keeping the cursor on a tooltip, exiting a tooltip, entering a different message, changing threads, etc. Also tested clicking a copy button multiple times.

Reviewers: kamil, inka, ginsu, przemek

Reviewed By: kamil, przemek

Subscribers: ashoat, atul

Differential Revision: https://phab.comm.dev/D6088