Update PVC Usage Metrics

[VaishnaviHire]

Description

After previous changes in Federation route, we no longer get duplicate entries for the metrics. This commit updates PVC
usage metrics to remove prometheus_replica from the alerting rules.

How Has This Been Tested?

1. Deploy RHODS instance
2. Manually run https://github.com/redhat-rhods-qe/ods-ci-notebooks-main/blob/main/notebooks/200__monitor_and_manage/203__alerts/notebook-pvc-usage/fill-notebook-pvc-over-90.ipynb to verify if alerts are getting triggered

• The commits are squashed in a cohesive manner and have meaningful messages.
• For commits that came from upstream, [UPSTREAM] has been prepended to the commit message.
• JIRA link(s): https://issues.redhat.com/browse/RHODS-4797
• The Jira story is acked.
• Live build image: quay.io/vhire/rhods-operator-live-catalog:1.15.0-rhods-4797
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work.
• QE contact acknowledges that this has been tested and is approved for merge.

[crobby]

Looks right to me

[crobby]

I've seen this working well.

[pablofelix]

lgtm

[anishasthana]

The change work as expected.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: anishasthana, crobby, pablofelix

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[samuelvl]

/label qe-approved

[openshift-ci]

@samuelvl: The label(s) qe-approved cannot be applied, because the repository doesn't have them.

In response to this:

/label qe-approved

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[samuelvl]

/label qe-approved