test_ceph_metrics_presence_when_osd_down avoid failures because of trying to reach OSD pods

[DanielOsypenko]

failure case: https://reportportal-ocs4.apps.ocp-c1.prod.psi.redhat.com/ui/#ocs/launches/557/14972/694869/694945/694948/log

osd_to_stop = osds[-1]
E IndexError: list index out of range

In an OCS external mode cluster, the OSD pods are managed by external ceph and may not be directly visible or manageable

[openshift-ci]

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[DanielOsypenko]

@fbalak please check this case, if I am right

[fbalak]

@fbalak please check this case, if I am right

You are right but we should find a way how to access the external ceph cluster during a test run and shut down its components for alert testing and not just skip those tests.

[openshift-merge-robot]

PR needs rebase.

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