Move cluster package e2e tests to integration tests

[pablochacin]

Description

Moves the cluster tests to the package as integration tests. The are no changes to the tests.

Checklist:

• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [x] I have run linter locally (make lint) and all checks pass.
• [x] I have run tests locally (make test) and all tests pass.
• [x] I have run relevant integration test locally
• [ ] I have run relevant e2e test locally (make e2e-xxx for disruptors, kubernetes or cluster related changes)
• [ ] Any dependent changes have been merged and published in downstream modules
  

[pablochacin]

@roobre these tests do not use the e2e test framework at all. In fact, the cluster package is used by the e2e test framework.

The benefit is to separate the tests that actually use the e2e framework (basically, the disruptor test) from the tests that target one single component, like this one.

I have changed the name of the test clusters to avoid any reference to e2e, in case this may induce confusion.

[roobre]

Makes sense, I think what confused me was that both used kind-related things under the hood.

[pablochacin]

I think what confused me was that both used kind-related things under the hood.

The purpose of this package is to isolate the e2e tests from the actual test infrastructure we use (in this case, kind). So is not that they both use the same infrastructure but this cluster package provides the infrastructure to the e2e tests. The tests we are moving here just test the integration with kind.