🐛 pkg/metrics/workqueue.go: remove deprecated metrics

[joelanford]

Deprecated metrics from upstream k8s.io/client-go/util/workqueue were removed in 1.16, so they can now be safely removed from controller-runtime.

See: kubernetes/client-go@ee078c7

[k8s-ci-robot]

Hi @joelanford. Thanks for your PR.

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[DirectXMan12]

/lgtm
/approve

[k8s-ci-robot]

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