Remove 'experimental' disclaimer for Seed{Authorizer,Restriction}
features
#4326
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How to categorize this PR?
/area security documentation
/kind enhancement
What this PR does / why we need it:
This PR removes the 'experimental' disclaimer for the
Seed{Authorizer,Restriction}
features. It is considered ready and can be used for production landscapes.Which issue(s) this PR fixes:
Fixes #1723
Release note:
Similar to the [`NodeAuthorizer`](https://kubernetes.io/docs/reference/access-authn-authz/node/) and [`NodeRestriction`](https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/#noderestriction) features in Kubernetes (preventing kubelets from accessing resources which aren't associated with their responsible `Node`s), Gardener does now have a `SeedAuthorizer` and `SeedRestriction` feature (preventing gardenlets from accessing resources which aren't associated with their `Seed`s). If you want to enable it for your landscapes then please consult [this document](https://github.com/gardener/gardener/blob/master/docs/deployment/gardenlet_api_access.md).