[lib][native][web] Introduce chatMessageItemHasEngagement

Summary:
This diff addresses a bug where MultimediaMessageTooltipButton and TextMessageTooltipButton on native were only rendering TooltipInlineEngagement when a sidebar existed, but not when a reaction existed.

TooltipInlineEngagement is meant to be rendered exactly when InlineEngagement is, so these checks should be identical. It was introduced in D4825, which was (slightly) before reactions were implemented (you can see reactions in the test plan, but diff comments review that it was hacked as a demo, and reactions at the time had not been landed yet).

Depends on D13677

Test Plan: Confirm visually (on iOS simulator) that TooltipInlineEngagement gets rendered over cases where a message has a reaction but not a sidebar

Reviewers: tomek

Reviewed By: tomek

Differential Revision: https://phab.comm.dev/D13678