[web] implement emoji keyboard position into message tooltip

Summary:
implement emoji keyboard position into the message tooltip and remove the old positioning code that is no longer relevant

Depends on D6632
Linear Task: ENG-2849

Test Plan:
Please watch the demo video to see the changes I made:

Testing a window that changes screen size:

Reviewers: rohan, ashoat

Reviewed By: ashoat

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D6634