sched: de-duplicate plugin registration logic by using FactoryAdapter

[Huang-Wei]

What type of PR is this?

/kind cleanup
/sig scheduling

What this PR does / why we need it:

A follow-up of #104998 (comment)

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

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[Huang-Wei]

/assign @chendave

[k8s-ci-robot]

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[ahg-g]

/lgtm