WIP VM Network Utilization as multi-line chart

[mareklibra]

As part if this PR, the UtilizationItem is enhanced for multi-line charts.

TODO:

• rebase this on kubevirt: Add VM Utilization card #3153

[openshift-ci-robot]

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[mareklibra]

A simplified version of this is in #3153 to have the card landed before development freeze.

This PR will be rebased on top of the #3153 and will be focused on implementing the multi-line charts.

[openshift-ci-robot]

@mareklibra: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/prow/frontend	1515663	link	/test frontend
ci/prow/e2e-aws-console-olm	1515663	link	/test e2e-aws-console-olm
ci/prow/e2e-gcp-console	1515663	link	/test e2e-gcp-console
ci/prow/analyze	1515663	link	/test analyze

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[mareklibra]

Closing in favour of #4008

[openshift-ci-robot]

@mareklibra: PR needs rebase.

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