HMS-8576: Add Kessel integration

[rverdile]

Summary

Implements dual path for RBAC v1 vs Kessel. Uses Kessels if the backend features API returns that it is enabled and accessible for the org.

Testing steps

1. Spin up the backend with features.kessel.enabled=false in your config.yaml
2. In the network tab, check the rbac requests, you'll see one for content-sources to /rbac/v1/access
3. Change the backend to features.kessel.enabled=true
4. In the network tab, there will no longer be a request to rbac v1 for content sources. Instead, you'll see a request to checkselfbulk

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[xbhouse]

https://issues.redhat.com/browse/HMS-8576