Automatic merge from submit-queue (batch tested with PRs 67748, 67769). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Remove second round of scaling in load test

As it seems redundant to do this twice, not really adding much value. This should cut down ~1.5h in our 5k-node load tests, and helps a bit with https://github.com/kubernetes/test-infra/issues/8348.

/cc @wojtek-t 

```release-note
NONE
```