WIP: refactor log collection, collect metrics

[BenTheElder]

• consolidate common log collection code
• capture metrics (we want this for testing Kubernetes, see Invariant Signal Collection for Kubernetes Testing kubernetes/enhancements#5196)

[k8s-ci-robot]

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[BenTheElder]

1.28 .. 1.30 is again #3978 (comment)

[k8s-ci-robot]

@BenTheElder: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kind-e2e-kubernetes-1-29	b608739	link	true	/test pull-kind-e2e-kubernetes-1-29
pull-kind-e2e-kubernetes-1-28	b608739	link	true	/test pull-kind-e2e-kubernetes-1-28
pull-kind-e2e-kubernetes-1-30	b608739	link	true	/test pull-kind-e2e-kubernetes-1-30

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[BenTheElder]

filed kubernetes/test-infra#35264

[BenTheElder]

going another route, and we merged the cleanup work