Add tier1 post-upgrade test to verify the existence of noobaa prometheus ruels

[sagihirshfeld]

Summary

• Adds test_noobaa_prometheus_rules_exist to verify the
  noobaa-prometheus-rules PrometheusRule CR exists and contains rule groups
• Marked tier1 + post_upgrade so it runs in post-upgrade CI pipelines

Motivation

A stakeholder reported missing NooBaa Prometheus alerting rules after upgrading
ODF 4.21 → 4.22. Investigation confirmed we had zero post-upgrade test coverage
for PrometheusRule CR existence.

[sagihirshfeld]

/cherry-pick release-4.21

[openshift-cherrypick-robot]

@sagihirshfeld: once the present PR merges, I will cherry-pick it on top of release-4.21 in a new PR and assign it to you.

Details

In response to this:

/cherry-pick release-4.21

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[ocs-ci]

PR validation on existing cluster

Cluster Name: shirshfe-22ibm09
Cluster Configuration: conf/deployment/ibmcloud/ipi_3az_rhcos_3m_3w.yaml
PR Test Suite:
PR Test Path: tests/functional/object/mcg/test_endpoint_network_disruption.py
Additional Test Params: --skip-rpm-go-version-collection
OCP VERSION: 4.22
OCS VERSION: 4.22
tested against branch: master

Job FAILED (installation failed, tests not executed).

[ocs-ci]

PR validation on existing cluster

Cluster Name: shirshfe-22ibm09
Cluster Configuration: conf/deployment/ibmcloud/ipi_3az_rhcos_3m_3w.yaml
PR Test Suite:
PR Test Path: tests/functional/monitoring/prometheus/alerts/test_noobaa.py::test_noobaa_prometheus_rules_exist
Additional Test Params: --skip-rpm-go-version-collection
OCP VERSION: 4.22
OCS VERSION: 4.22
tested against branch: master

Job PASSED.

[ypersky1980]

LGTM

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sagihirshfeld, ypersky1980

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