[web] Rename messageTooltipIcon to messageActionLinkIcon

Summary: Change of names used in reply and action button for messages to be clear what we call 'tooltip'

Test Plan: Flow, check if visually nothing changed

Reviewers: palys-swm, ashoat

Reviewed By: palys-swm, ashoat

Subscribers: ashoat, palys-swm, Adrian, atul

Differential Revision: https://phabricator.ashoat.com/D994