Exclamation mark over an avatar should say "User unable to merge" when you hover over the exclamation mark

Summary

There's no longer an explanation about the exclamation mark (It used to say "User unable to merge" when you hover the exclamation mark)

Steps to reproduce

1. Go to a merge request where any assignee/reviewer doesn't have merge rights
2. Hover over exclamation mark

What is the current bug behavior?

No explanation for what the exclamation mark means

What is the expected correct behavior?

An explanation for what the exclamation mark means

Relevant logs and/or screenshots

Example MR: gitlab-com/www-gitlab-com!104230 (merged)

Relevant Slack conversations:

• https://gitlab.slack.com/archives/C0AR2KW4B/p1652398929869799
• https://gitlab.slack.com/archives/CETG54GQ0/p1652399412452849

Output of checks

This bug happens on GitLab.com