Filter runners by Group and Project on Admin dashboard

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What does this MR do and why?

This adds a filtering option on the Admin runners dashboard to filter runners by the owning group or project.

For organizations with many runners, this is a usability improvement for this page.

References

• Epic: &7164 (closed)
• Issue: #378558
• Backend MR (merged): !150347 (merged)

Screenshots or screen recordings

20250905-1224-33.7485608.mp4

How to set up and validate locally

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