Prepare and include demo of olmv1 commands in kubectl-operator plugin README

[azych]

Once we're done with extending kubectl-operator plugin with all the new olmv1 commands (and possibly deprecate olmv0 from there), we should prepare an asciicinema demo and include it in the kubectl-operator README, similar to how it's currently done for olmv0.

[joelanford]

We should also update the extension developer e2e to use kubectl operator rather than all of this: https://github.com/operator-framework/operator-controller/blob/a6de9f94e085989a086459f2b5325a5cd27424b0/test/extension-developer-e2e/extension_developer_test.go#L40-L199

[github-actions[bot]]

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[ankitathomas]

https://github.com/operator-framework/kubectl-operator/pull/238