bring back ToolchainCluster.spec.apiEndpoint back as an optional field

before we can finally remove it in the next step.

config/crd/bases/toolchain.dev.openshift.com_toolchainclusters.yaml

@@ -43,6 +43,13 @@ spec:
           spec:
             description: ToolchainClusterSpec defines the desired state of ToolchainCluster
             properties:
+              apiEndpoint:
+                description: "The API endpoint of the member cluster. This can be
+                  a hostname, hostname:port, IP or IP:port. \n Be aware that this
+                  is kept in the spec only for compatibility reasons and doesn't serve
+                  any purpose. Use the Status.APIEndpoint instead. \n Deprecated:
+                  This is not used for anything."
+                type: string
               secretRef:
                 description: Name of the secret containing the kubeconfig required
                   to connect to the cluster.