chore: Drop manual overlay patches superseded by upstream v2.0.0-alpha.2

The kubeflow/notebooks v2.0.0-alpha.2 release now includes pod security
standard labels, security contexts, network policies, and aggregated
RBAC ClusterRoles natively. Drop the patches and resources we were
maintaining manually in the local overlay.

Signed-off-by: Christian Heusel <christian@heusel.eu>

Author: christian-heusel

applications/workspaces/overlays/istio/kustomization.yaml

@@ -10,30 +10,3 @@ resources:
 - ../../upstream/backend/overlays/istio
 - ../../upstream/controller/overlays/istio
 - ../../upstream/frontend/overlays/istio
-- workspaces-base-edit-clusterrole.yaml
-- network-policies/default-allow-same-namespace.yaml
-- network-policies/workspaces-backend.yaml
-- network-policies/workspaces-frontend.yaml
-
-patches:
-- path: patches/namespace-pss.yaml
-- path: patches/backend-pss.yaml
-- path: patches/frontend-pss.yaml
-- patch: |-
-    - op: replace
-      path: /rules
-      value: []
-  target:
-    group: rbac.authorization.k8s.io
-    kind: ClusterRole
-    name: kubeflow-workspaces-edit
-
-# Can be dropped with the next release:
-# https://github.com/kubeflow/notebooks/pull/1032
-images:
-- name: ghcr.io/kubeflow/notebooks/workspaces-backend
-  newTag: 2.0.0-alpha.1
-- name: ghcr.io/kubeflow/notebooks/workspaces-controller
-  newTag: 2.0.0-alpha.1
-- name: ghcr.io/kubeflow/notebooks/workspaces-frontend
-  newTag: 2.0.0-alpha.1