User popover: Allow to break long usernames

What does this MR do and why?

User popover: Break long usernames

Allows breaking very long generative usernames onto multiple lines.

Reported via #is_this_known by @leetickett-gitlab & @msedlakjakubowski

Screenshots or screen recordings

Before After
before after

How to set up and validate locally

  1. Add a new user
  2. Add user to project
  3. Impersonate with user
  4. Visit an issue within the project (e.g. https://gdk.test:3000/flightjs/Flight/-/issues/42) and add a comment

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #513105 (closed)

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