e2e: script for removing orphaned e2e clusters

[notnoop]

Adds a script for cleaning up e2e clusters, the brute force way without needing the terraform state file.

This script is handy when an e2e job fails in mysterious ways without cleaning, or an engineer spin up a dev cluster and left it unattended for a long time.

It has been useful for me while I was working on getting e2e infrastructure running on circleci.

[tgross]

This script is pretty destructive, so we should probably enforce that it's being passed with this argument. Some of these functions would result in destroying all instances of the component, because they have "contains" filters.

I'd also love to get a "I'm gonna destroy X, are you sure?" confirmation too, but that's maybe paranoid. 😀

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