[scheduler cleanup phase 1]: Refactor factory_test.go to use a fake k8s client

[misterikkit]

PLEASE COORDINATE WITH SIG-SCHEDULING BEFORE WORKING ON THIS ISSUE. We want to avoid the situation where two people accidentally start work on the same fix.
Main tracking issue: #68951

The tests in pkg/scheduler/factory/factory_test.go depend on mocking REST/HTTP with the utils in pkg/scheduler/testing. It would be much simpler to use k8s.io/client-go/kubernetes/fake.Clientset instead. None of the behavior under test depends on how the REST and HTTP stuff behaves.

/ref #68962
/sig scheduling
/kind cleanup
/help

[shubheksha]

I'm working on a very similar fix for service-catalog, so I can pick this up as well!

[shubheksha]

Ref kubernetes-retired/service-catalog#2358

[k8s-ci-robot]

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[shubheksha]

@tossmilestone, are you interested in working on this issue?

[tossmilestone]

@shubheksha yes, if you are not working on it, I will have a try. Thanks!

[misterikkit]

@tossmilestone Have you started this? How is it going?
/assign @tossmilestone
/remove-help

[k8s-ci-robot]

@misterikkit: GitHub didn't allow me to assign the following users: tossmilestone.

Note that only kubernetes members and repo collaborators can be assigned.
For more information please see the contributor guide

In response to this:

@tossmilestone Have you started this? How is it going?
/assign @tossmilestone
/remove-help

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[tossmilestone]

@misterikkit, I am now working on it. It will be done later.

[tossmilestone]

@misterikkit This Issue has been done, PTAL. See #69412.