Free the item from the taint manager workqueue when done

[liggitt]

fixes https://bugzilla.redhat.com/show_bug.cgi?id=1588244

This fixes a clear leak that left objects in the workqueue "processing" map.

Will open a follow up to make the workqueue key more efficient.

/cc @mfojtik

[liggitt]

/cherrypick release-3.10

[openshift-cherrypick-robot]

@liggitt: once the present PR merges, I will cherry-pick it on top of 3.10 in a new PR and assign it to you.

In response to this:

/cherrypick 3.10

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[liggitt]

/retest

[mfojtik]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: liggitt, mfojtik

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• vendor/k8s.io/kubernetes/pkg/controller/OWNERS [liggitt,mfojtik]

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[mfojtik]

/retest

[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.

[liggitt]

/hold

It's unclear whether we want to continue picking upstream changes into master ahead of the rebase. Holding this for now, will test and merge the PR against the 3.10 branch

[liggitt]

proceeding with #20071 for 3.10. will leave this open, but hold for the rebase (and will actually pick this fix up in a 1.11.0 rebase)

[openshift-bot]

@liggitt: PR needs rebase.

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