[RHSTOR-4798] MDSCacheUsageHigh alert feature test cases automation.

[nagendra202]

[RHSTOR-4798] MDSCacheUsageHigh alert feature test cases automation.

Feature Released: 4.15

Test Plan: https://docs.google.com/spreadsheets/d/172CiopML3LbPC3AN9Dm6lKFzfvbs-Etxj6YTYPBZ9Ew/edit#gid=1005735948

Automated below two tests: [linked to Polarion OCS-5478]

1. RHSTOR-4798 Verify MDSCacheUsageHigh alert and actionable link.
2. RHSTOR-4798 Verify alert with node drain.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: nagendra202

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[ocs-ci]

PR validation on existing cluster

Cluster Name: nagreddy-m2-2
Cluster Configuration: conf/ocsci/ibmcloud_region_dynamic_switching.yaml
PR Test Suite: tier2
PR Test Path: tests/functional/monitoring/prometheus/alerts/test_alert_mds_cache_high_usage.py
Additional Test Params:
OCP VERSION: 4.16
OCS VERSION: 4.16
tested against branch: master

Job FAILED (installation failed, tests not executed).

[openshift-merge-robot]

PR needs rebase.

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