[web] Move tooltip-utils into web/utils

Summary: The diff moved tooltip-utils into utils folder on web. The test already has been in that folder.

Test Plan: Flow, checked manually if everything related to tooltip still works on web.

Reviewers: tomek, atul

Reviewed By: tomek, atul

Subscribers: ashoat, abosh

Differential Revision: https://phab.comm.dev/D5021