🌱 update unit test gha to test against the k8s version of client-go

[perdasilva]

Description of the change:
The unit test job was testing against an old/pinned version of the kube libs. This PR updates the gha to take the kube version from the go-client lib and simplifies the makefile and unit test gha a bit

This PR also fixes a couple of flakes I've found along the way:

• in the installplan e2e, a csv update step would flake due to update conflicts
• in the subscription e2e a consistently block would execute before the resource could be updated

Motivation for the change:
unit test stage failing for latest kube version

Architectural changes:

Testing remarks:

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Bug fixes are accompanied by regression test(s)
• e2e tests and flake fixes are accompanied evidence of flake testing, e.g. executing the test 100(0) times
• tech debt/todo is accompanied by issue link(s) in comments in the surrounding code
• Tests are comprehensible, e.g. Ginkgo DSL is being used appropriately
• Docs updated or added to /doc
• Commit messages sensible and descriptive
• Tests marked as [FLAKE] are truly flaky and have an issue
• Code is properly formatted

[m1kola]

/lgtm

[openshift-ci]

New changes are detected. LGTM label has been removed.

[m1kola]

/lgtm