Automatic merge from submit-queue (batch tested with PRs 40060, 44860, 44865, 44825, 44162)

Validate etcd only when expecting to run etcd

If running kubelet only, there is no need to validate etcd as the script will not attempt to start etcd. In fact, validating etcd here may cause the script to fail when one wants to run "nokubelet" right before "kubeletonly" because etcd will definitely be running
```release-note
NONE
```