sched: remove unneeded json tags in unversioned API objs

[Huang-Wei]

What type of PR is this?

/kind cleanup
/sig scheduling

What this PR does / why we need it:

The internal API objects don't need a json tag. This PR does the cleanup work to make the internal types.go consistent.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

@Huang-Wei: This issue is currently awaiting triage.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[k8s-triage-robot]

This PR may require API review.

If so, when the changes are ready, complete the pre-review checklist and request an API review.

Status of requested reviews is tracked in the API Review project.

[ahg-g]

/lgtm

[k8s-triage-robot]

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/retest