cmd/kube-scheduler: add usage message only when parsing flags failed

[sanposhiho]

What type of PR is this?

/kind feature

What this PR does / why we need it:

print the usage message when flag parsing error

Related to #104503

We changed it not to print usage message on cmd/kube-scheduler for the following reason.

But if we don't set SilenceErrors and SilenceUsage on this PR, usage will be print when cobra.Command.RunE return an error.
#104503 (comment)

In this PR, I change it to print the usage error only when flag parsing error.

Which issue(s) this PR fixes:

Fixes #

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]

@sanposhiho: This issue is currently awaiting triage.

If a SIG or subproject determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

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[damemi]

/approve

[spiffxp]

/test pull-kubernetes-e2e-kind-canary
/test pull-kubernetes-e2e-gce-canary
/test pull-kubernetes-integration-go-canary
/test pull-kubernetes-unit-go-canary
/test pull-kubernetes-verify-go-canary

Testing an arbitrary PR with canary jobs to validate new nodepool is working as expected. None of these are merge-blocking so your PR won't be affected.

ref: kubernetes/test-infra#23783
ref: kubernetes/k8s.io#1187 (comment)

[spiffxp]

/test pull-kubernetes-e2e-kind-canary
/test pull-kubernetes-e2e-gce-canary
/test pull-kubernetes-integration-go-canary
/test pull-kubernetes-unit-go-canary
/test pull-kubernetes-verify-go-canary

[spiffxp]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: damemi, sanposhiho, spiffxp

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• cmd/kube-scheduler/OWNERS [damemi]

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