Add "Running" and "Finished" on-demand scans tabs
What does this MR do and why?
This adds two new tabs to the on-demand scans index page:
- The "Running" tab shows currently running on-demand scans.
- The "Finished" tab shows on-demand scans that completed.
Screenshots or screen recordings
| Running scans (empty state) | Finished scans |
|---|---|
 |
 |
How to set up and validate locally
- Visit the on-demand scans index page at
/:namespace/:project/-/on_demand_scans.
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 #341373 (closed)