chore: replace kubectl image usage w/ MCR

Author: jpayne3506

hack/manifests/kubectl.yaml

@@ -6,7 +6,7 @@ metadata:
 spec:
   containers:
   - name: kubectl
-    image: docker.io/bitnami/kubectl:latest
+    image: mcr.microsoft.com/oss/v2/kubernetes/kubectl
     command: ["/bin/bash", "-c", "--"]
     args: ["sleep 3600"]
     env:

test/integration/manifests/cilium/watcher/deployment.yaml

@@ -198,7 +198,7 @@ spec:
       serviceAccountName: cilium-watcher-sa
       containers:
         - name: ds-watcher
-          image: bitnami/kubectl:latest
+          image: mcr.microsoft.com/oss/v2/kubernetes/kubectl
           command:
             - /bin/sh
             - -c
@@ -260,7 +260,7 @@ spec:
               done
 
         - name: rbac-watcher
-          image: bitnami/kubectl:latest
+          image: mcr.microsoft.com/oss/v2/kubernetes/kubectl
           command:
             - /bin/sh
             - -c