Tests to confirm that registry+v1 bundles with with install mode other than `AllNamespaces` are not allowed

[m1kola]

The relevant check is currently in rukpak, but I'm planning to add a test in operator-controller. This will help to ensure that we do not break the checks in the process of moving rukpak functionality into operator controller.

[m1kola]

Blocked at the moment: we need to bump rukpak to be able to add this test because we need this fix, but bumping rukpak will break helm integration work.

[m1kola]

No longer blocked, but I realised that rukapk validation allows more than we want at the moment. Created operator-framework/rukpak#913 to tighten the validation.

[m1kola]

We decided not to do the tests in operator-controller and have this stuff tested in rukpak instead. I checked rukpak test coverage and added missing tests for both this limitation and for #815.

Test coverage was added in operator-framework/rukpak#922
And removed e2e coverage for for webhooks limitation from operator-controller in #946

I think we are done here. Closing.