Automatic merge from submit-queue

node e2e script: call 'gcloud compute' only if necessary

**What this PR does / why we need it**:

The ``gcloud compute`` is called everytime even if it is not needed.
When runnin node e2e tests on RHEL, the test-e2e-node.sh script is run
the way in which it takes execution path without ``gcloud`` invocation.

With the current code, ``gcloud`` is called everytime.
Thus introducing additional runtime dependency.

**Special notes for your reviewer**:

First introduced here: https://github.com/kubernetes/kubernetes/pull/29815