Add a possibility of setting GODEBUG env var for kube-apiserver binary

[tosi3k]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This change provides a convenient knob to set GODEBUG env var in kube-apiserver manifest. This can be used to increase Golang-related debuggability of kube-apiserver.

Which issue(s) this PR fixes:

No issue is opened for that.

Special notes for your reviewer:

/sig scalability
/assign @mborsz

Does this PR introduce a user-facing change?

NONE

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

None.

[k8s-ci-robot]

Please note that we're already in Test Freeze for the release-1.25 branch. This means every merged PR will be automatically fast-forwarded via the periodic ci-fast-forward job to the release branch of the upcoming v1.25.0 release.

Fast forwards are scheduled to happen every 6 hours, whereas the most recent run was: Thu Aug 18 07:40:11 UTC 2022.

[k8s-ci-robot]

@tosi3k: 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.

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[mborsz]

/lgtm

[mborsz]

/approve

[tosi3k]

/assign @mm4tt

[mm4tt]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mborsz, mm4tt, tosi3k

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• cluster/gce/OWNERS [mm4tt]

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