Add a total number of runners in Group view

Description

As part of the UX Scorecard recommendations, it was really unclear for me to figure out how many runners I had at one time. I thought updating pagination to use pagination basic would be a fix, but after talking with @mrincon , that would negatively impact the performance. Adding a total would help when Priyanka is checking runners at group and project levels, as well as taking actions from the instance view.

Proposed solution

This is partly covered in #339527 (closed) for Instance runners

  • Enhance our current filtering capability to communicate runner status at a high level and improve discoverability
    • Count of online runners
    • Count of offline runners (when we have the ability to show)
    • Count of stale runners (when we have the ability to show)
Edited by Darren Eastman