Implement internal endpoint to retrieve applicable runner controllers
What does this MR do and why?
Implement internal endpoint to retrieve applicable runner controllers
This change set introduces a new internal REST API endpoint for KAS (Job Router) to retrieve applicable runner controllers for admission control given a runner. Currently, all registered runner controllers are applicable since we don't have any scoping yet (will be introduced with #582825).
The endpoint is behind the feature flag for the job router and additionally a new one specifically for admission control.
References
Refs #582799
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