[web] convert createTooltip to getTooltipPositionStyle

Summary:
In an effort to make the tooltip code more component agnostic, I refactored this function to only get and return the tooltip position style since this logic can be reused for every single different type of tooltip we introduce in the future (which we are about to do shortly), and factored out any message tooltip specific code and put it back into the useMessageTooltip hook

Depends on D8826

Test Plan: flow and confirmed that the message tooltip on web still behaves and works as expected

Reviewers: atul, kamil, rohan

Reviewed By: atul, rohan

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8827