[Cherry-pick] Add missing labels on RayCluster TPU manifests (#1987) (#2015)

Author: kevin85421

ray-operator/config/samples/ray-cluster.tpu-v4-multihost.yaml

@@ -4,6 +4,9 @@
 apiVersion: ray.io/v1
 kind: RayCluster
 metadata:
+  # Label required for TPU webhook to initialize environments.
+  labels:
+    app.kubernetes.io/name: kuberay
   name: example-cluster-kuberay
 spec:
   headGroupSpec:

ray-operator/config/samples/ray-cluster.tpu-v4-singlehost.yaml

@@ -4,6 +4,9 @@
 apiVersion: ray.io/v1
 kind: RayCluster
 metadata:
+  # Label required for TPU webhook to initialize environments.
+  labels:
+    app.kubernetes.io/name: kuberay
   name: example-cluster-kuberay
 spec:
   headGroupSpec: