Filter runners on admin page by owning Group

What does this MR do and why?

Filter runners on admin page by owning Group

This adds a filtering option on the Admin runners dashboard to filter runners by the owning group. For organizations with many runners, this is a usability improvement for this page.

This is merge request 1 of 3 (See original MR here: Filter runners by Group and Project on Admin da... (!180396)

Co-authored-by: Martin Duffy martin.duffy@kitware.com

References

Screenshots or screen recordings

20250905-1224-33.7485608.mp4

How to set up and validate locally

1. Create any number of runners associated with a group
2. Navigate to the Runners page of the Admin Dashboard
3. In the filter bar, select "Group" and choose a value equal to the full path of the group (ex: Flightjs)

MR acceptance checklist

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