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[bot]]

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[jgwest]

/retest

[jparsai]

/lgtm

[jgwest]

Thanks @jparsai!