fix CVE namespace-isolation break

[anandrkskd]

argocd adds cluster monitoring label if the ns contains openshift- prefix

What type of PR is this?

/kind bug

What does this PR do / why we need it:
This PR fixes the namespace isolation break, caused by using cluster-monitoring label for monitoring
Have you updated the necessary documentation?

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

Which issue(s) this PR fixes:

Fixes GITOPS-6251

Test acceptance criteria:

• Unit Test
• E2E Test

How to test changes / Special notes to the reviewer:

[openshift-ci]

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[anandrkskd]

/retest

[openshift-ci]

@anandrkskd: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v4.17-kuttl-parallel	90bdfbd	link	true	/test v4.17-kuttl-parallel

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