[OSSM-8154] Remove Custom Prometheus operator and test #744
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After the community Prometheus operator is deleted (which I added last week by #739 ), there is an issue in some monitoring-related Prometheus/alertmanager pods in openshift-monitoring namespace. The cluster already contains the Prometheus operator for openshift-monitoring so probably there is some incompatibility between in cluster Prometheus operator vs community one ( which is two years old btw :/ ) [probably the Prometheus community operator does something during the uninstalling which badly influences in cluster Prometheus operator]. So this pr removes it from MTT.
However, Incluster Prometheus operator doesn't manage Prometheus CR in custom namespaces so right now, there is no way to install custom Prometheus via Prometheus CR or install Prometheus operator via OLM anymore. ( In that case, I suggest to remove custom prometheus test from MTT [since we have a test for integration with openshift monitoring prometheus instance and it test the same things]
https://master-jenkins-csb-servicemesh.apps.ocp-c1.prod.psi.redhat.com/job/maistra/job/maistra-test-tool/2777/