Mark openshift & xKS e2e tests

[anandrkskd]

What type of PR is this?

/kind enhancement

What does this PR do / why we need it:
Operator currently only tested on OpenShift. This PR enables running e2e suite on non-OpenShift Kubernetes (xKS) by separating OpenShift-dependent tests via labels. Run --label-filter="!openshift" on xKS to skip tests requiring Routes/ConsoleLinks/SCCs/OLM. Broadens CI coverage to vanilla k8s environments.

Have you updated the necessary documentation?

• Documentation update is required by this PR.
• Documentation has been updated.

Which issue(s) this PR fixes:

Fixes #?

Test acceptance criteria:

• Unit Test
• E2E Test

How to test changes / Special notes to the reviewer:
LOCAL_RUN=true NON_OLM=true ./bin/ginkgo -v --trace -p --timeout 240m -r ./test/openshift/e2e/ginkgo/sequential
LOCAL_RUN=true NON_OLM=true ./bin/ginkgo -v --trace -p --timeout 240m -r ./test/openshift/e2e/ginkgo/parallel

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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