Run Rollouts operator E2E tests in both namespace/cluster scoped

[jgwest]

What type of PR is this?
/kind enhancement

What does this PR do / why we need it:
At present, we only run the Argo Rollouts Operator cluster-scoped tests. This PR adds logic that allows us to ALSO run the namespace-scoped Argo Rollouts tests. (Ensuring coverage of both scenarios, for users of gitops operator)

How to test changes / Special notes to the reviewer:
I've tested it manually on clusterbot OpenShift, and all tests pass.

[openshift-ci]

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[jgwest]

/retest

image fail

[jgwest]

/retest

time="2025-01-16T15:03:56Z" level=fatal msg="Failed to run bundle: error waiting for CSV to install: timed out waiting for the condition\n"
{"component":"entrypoint","error":"wrapped process failed: exit status 1","file":"sigs.k8s.io/prow/pkg/entrypoint/run.go:84","func":"sigs.k8s.io/prow/pkg/entrypoint.Options.internalRun","level":"error","msg":"Error executing test process","severity":"error","time":"2025-01-16T15:03:56Z"} 

[jgwest]

/retest

 time="2025-01-16T16:56:30Z" level=fatal msg="Failed to run bundle: error waiting for CSV to install: timed out waiting for the condition\n"
{"component":"entrypoint","error":"wrapped process failed: exit status 1","file":"sigs.k8s.io/prow/pkg/entrypoint/run.go:84","func":"sigs.k8s.io/prow/pkg/entrypoint.Options.internalRun","level":"error","msg":"Error executing test process","severity":"error","time":"2025-01-16T16:56:30Z"}
error: failed to execute wrapped command: exit status 1 
INFO[2025-01-16T16:56:30Z] Step kuttl-parallel-install failed after 2m16s. 
INFO[2025-01-16T16:56:30Z] Step phase test failed after 2m16s.          
INFO[2025-01-16T16:56:30Z] Running multi-stage phase post