Scheduler: organize scheduler unit tests into subtests

[gavinfish]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:
Organize left unit tests which are not in subtests.

Which issue(s) this PR fixes:

Fixes #98573

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

none

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

@gavinfish: This issue is currently awaiting triage.

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[gavinfish]

/assign @Huang-Wei

[gavinfish]

/test pull-kubernetes-e2e-kind

[fejta-bot]

Unknown CLA label state. Rechecking for CLA labels.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/check-cla

[Huang-Wei]

/lgtm
/approve

Thanks.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gavinfish, Huang-Wei

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• pkg/scheduler/OWNERS [Huang-Wei]

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