DO NOT MERGE: Add per pod/namespace eviction counter to assess impact

[smarterclayton]

We do not know what multiple of workload is disrupted during an upgrade
(whether we on average evict pods once, twice, or more as they bounce
around the cluster on node upgrades). Add a test metric (this would not
be acceptable to merge because of cardinality bounding) to quantify
this in test scenarios.

Just for testing

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: smarterclayton
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[openshift-merge-robot]

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

Test name	Commit	Details	Rerun command
ci/prow/verify-commits	2bf5a82	link	/test verify-commits
ci/prow/e2e-agnostic-cmd	2bf5a82	link	/test e2e-agnostic-cmd
ci/prow/e2e-aws-serial	2bf5a82	link	/test e2e-aws-serial

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