cmd/k8s-operator,kube/kubeclient,docs/k8s: update rbac to emit events + small fixes (#14164)

This is a follow-up to #14112 where our internal kube client was updated
to allow it to emit Events - this updates our sample kube manifests
and tsrecorder manifest templates so they can benefit from this functionality.

Updates tailscale/tailscale#14080

Signed-off-by: Irbe Krumina <irbe@tailscale.com>

docs/k8s/sidecar.yaml

@@ -26,6 +26,14 @@ spec:
           name: tailscale-auth
           key: TS_AUTHKEY
           optional: true
+    - name: POD_NAME
+      valueFrom:
+        fieldRef:
+          fieldPath: metadata.name
+    - name: POD_UID
+      valueFrom:
+        fieldRef:
+          fieldPath: metadata.uid
     securityContext:
       capabilities:
         add: