The ui-plugin-operator is no longer needed from Rancher 2.9

Since Rancher 2.9 the ui-plugin-operator is built in the Rancher Dashboard.
The code is deprecated https://github.com/rancher/ui-plugin-operator?tab=readme-ov-file
and moved to Rancher dashboard controllers codebase https://github.com/rancher/rancher/tree/release/v2.9/pkg/controllers/dashboard/plugin

Author: jtomasek

asciidoc/components/rancher-dashboard-extensions.adoc

@@ -13,24 +13,7 @@ endif::[]
 
 Extensions allow users, developers, partners, and customers to extend and enhance the Rancher UI. SUSE Edge 3.1 provides KubeVirt and Akri dashboard extensions.
 
-See `https://ranchermanager.docs.rancher.com/integrations-in-rancher/rancher-extensions[Rancher documentation]` for general information about Rancher Dashboard Extensions.
-
-== Prerequisites
-
-To enable extensions Rancher requires ui-plugin operator to be installed. When using the Rancher Dashboard UI, navigate to *Extensions* in the left navigation *Configuration* section. If the ui-plugin operator is not installed you'll get a prompt asking to enable the extensions support as described `https://ranchermanager.docs.rancher.com/integrations-in-rancher/rancher-extensions#installing-extensions[here]`.
-
-The operator can be also installed using Helm:
-
-[,bash]
-----
-helm repo add rancher-charts https://charts.rancher.io/
-helm upgrade --create-namespace -n cattle-ui-plugin-system \
-  --install ui-plugin-operator rancher-charts/ui-plugin-operator
-helm upgrade --create-namespace -n cattle-ui-plugin-system \
-  --install ui-plugin-operator-crd rancher-charts/ui-plugin-operator-crd
-----
-
-Or with Fleet by creating a dedicated GitRepo resource. For more information see <<components-fleet,Fleet>> section and `https://github.com/suse-edge/fleet-examples/blob/main/gitrepos/rancher-ui-plugin-operator-gitrepo.yaml[fleet-examples]` repository.
+See `https://ranchermanager.docs.rancher.com/v2.9/integrations-in-rancher/rancher-extensions[Rancher documentation]` for general information about Rancher Dashboard Extensions.
 
 == Installation
 
@@ -117,7 +100,7 @@ helm:
 
 [NOTE]
 ====
-The `releaseName` property is required and needs to match the extension name to get the extension correctly installed by ui-plugin-operator.
+The `releaseName` property is required and needs to match the extension name to get the extension correctly installed.
 ====
 
 [,yaml]