Setup kubebuilder to run functional-tests in release workflow

[ChristianZaccaria]

Issue link

What changes have been made

The instascale-release.yml workflow is running all tests including the functional-tests ones without performing any setup for it: https://github.com/project-codeflare/instascale/blob/main/.github/workflows/instascale-release.yml#L54

We can see in the functional-test workflow that the steps for downloading kubebuilder and setting it up is necessary before running the functional-tests, for that reason it is failing. We could probably add the above highlighted fields in our release workflow and it should pass.

Verification steps

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • Testing is not required for this change

[sutaakar]

I think it may be enough to change Test step to run go test -v ./controllers.
The functional tests are executed for PR check when dependencies are upgraded, I think it is not necessary to run the test twice.

[sutaakar]

Or maybe to drop tests from release workflow completely, to rely on PR check.

[openshift-ci]

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