Document how to run e2e tests locally

[adrianmoisey]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Write down how the e2e tests can be run locally.

Which issue(s) this PR fixes:

Related to #8705

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[maxcao13]

Do we know the status of this document: https://github.com/kubernetes/autoscaler/blob/e6a68178e924e968138ed7d2349acdfc643339a7/vertical-pod-autoscaler/hack/local-cluster.md

Could we fit that in the new docs section?

[adrianmoisey]

Do we know the status of this document: e6a6817/vertical-pod-autoscaler/hack/local-cluster.md

Could we fit that in the new docs section?

Good call out. I've moved what I consider the relevant pieces across, deleted some other parts, and left the "Quick Integration Tests" behind, it can be cleaned up when #8985 is done