Automatic merge from submit-queue (batch tested with PRs 50281, 50747, 50347, 50834, 50852)
Add e2e aggregator test.
What this PR does / why we need it:
This adds an e2e test for aggregation based on the sample-apiserver.
Currently is uses a sample-apiserver built as of 1.7.
This should ensure that the aggregation system works end-to-end.
It will also help detect if we break "old" extension api servers.
Which issue this PR fixes (optional, in fixes #<issue number>(, fixes
fixes#43714
**Special notes for your reviewer**:
**Release note**: NONE
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