note that we don't change the behaviour of kubectl.
For example it won't scale new resources. That's the end goal.
The first step is to retrofit existing code to use the generic scaler.
This moves plugin/pkg/scheduler to pkg/scheduler and
plugin/cmd/kube-scheduler to cmd/kube-scheduler.
Bulk of the work was done with gomvpkg, except for kube-scheduler main
package.
Automatic merge from submit-queue (batch tested with PRs 47883, 47179, 46966, 47982, 47945)
Remove e2e test for least requested prioirty function
**What this PR does / why we need it**:
Deletes a flaky e2e test for "least requested" priority function of the scheduler. This priority function is tested more extensively in our unit tests.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#47769
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
