Automatic merge from submit-queue (batch tested with PRs 50254, 50174, 50179)
Moved node/testutil to upper dir.
**What this PR does / why we need it**:
Moved node/testutil to upper directory (`pkg/controller`); it's used by several controllers, and we need to test some helper func in `pkg/controller`.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: part of #49522
**Release note**:
```release-note
N/A
```
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