Add popovers to runner upgrade stat items
What does this MR do and why?
This change adds popovers to single stat summary data with definitions for upgrade stats.
Changelog: changed EE: true
Screenshots or screen recordings
How to set up and validate locally
Finding the outdated runner:
- Have a GitLab Ultimate license
- Go to the runner details in Admin -> Runners
- Check the "Upgrade available" and "Upgrade recommended" counters
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #369346 (closed)
Edited by Miguel Rincon