[Flux End-to-End] Gitless GitOps

[stefanprodan]

We should add a Gitless GitOps section the End-to-End guide that shows users how to use OCIRepository for both Flux artifacts and Helm charts.

[Drupi]

Will take care of that!

[matheuscscp]

This was added here:

https://fluxcd.io/flux/flux-e2e/#ocirepository-as-a-source

Thanks to @Iam-Karan-Suresh