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>.

federation: Move k/test/e2e_federation package to k/federation/test/e2e

No functional change. Just move federation e2e tests inside k/federation directory, so that it is easy to move federation out of core.

Issue ref: #52992

**Release note**:
```release-note
NONE
```

/cc @kubernetes/sig-federation-pr-reviews @irfanurrehman @madhusudancs