[web] rename calculateToolTipSize to calculateMessageTooltipSize

Summary:
this function calculates the size of the message tooltip so calculateMessageTooltipSize is a more accurate name

Depends on D8823

Test Plan: flow

Reviewers: atul, kamil

Reviewed By: kamil

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8858