ci(ws): run make test-e2e on GitHub Actions

[jiridanek]

This is something that works differently in new Kubebuilder, compared to what's in kubeflow/kubeflow notebook controller.

Previously, what they called e2e tests was running in envtest, but currently they expect to run in externally-provided kind. So, let's run this on CI as well, so we don't have dead code.

[ederign]

/lgtm

[jiridanek]

As per @thesuperzapper 's suggestion, I put in explicit kind version. Here's the CI running https://github.com/jiridanek/notebooks-v2/actions/runs/9602645980/job/26483942380

[thesuperzapper]

@jiridanek now that we have actual end-to-end tests (added in #30), I have rebased this PR and cleaned it up a little in 3e8beea and 7408921.

We should be good to merge now, so that tests run automatically on every PR for the controller.

/lgtm
/approve

[google-oss-prow]

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