Automatic merge from submit-queue. 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>.
Aggregator test uses framework namespace
**What this PR does / why we need it**:
Remove namespace duplicate in aggregator test, using test framework namespace instead of creating a new one.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#53478
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
/sig api-machinery
df03cf7136