Update help popover icon

What does this MR do and why?

This change updates the help popover icon to match our design system.

See: https://design.gitlab.com/usability/helping-users

MR	status
Update help popover icon (!83735 - merged)	👈 you are here
Add a "time in words" formatter for durations (!83740 - merged)	workflowin review
Adds status popover in runners table header (!83305 - merged)	workflowin dev

Screenshots or screen recordings

Note: This is a screenshot from Adds status popover in runners table header (!83305 - merged), where I add this icon to the view.

before	after

How to set up and validate locally

This change will be easily visible in the runners admin, see: !83305 (merged)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.