Automatic merge from submit-queue (batch tested with PRs 47066, 48892, 48933, 48854, 48894)

replace hardcoded use of "kubectl" in apply warning msg

**Release note**:
```release-note
NONE
```

Removes use of hardcoded "kubectl" in the `kubectl apply ...` warning message that is printed when the `last-applied-configuration` annotation is missing on a resource. This is useful for downstream wrappers around the `apply` command.

cc @stevekuznetsov @fabianofranz