Mark test_prometheus_rule_failures as flaky

[fbalak]

Fixes #11134
Reruns test_prometheus_rule_failures if failed to prevent disruption from previous test case

[fbalak]

Verified: https://jenkins-csb-odf-qe-ocs4.dno.corp.redhat.com/job/qe-deploy-ocs-cluster/45893/

[fbalak]

/cherry-pick release-4.17

[openshift-cherrypick-robot]

@fbalak: once the present PR merges, I will cherry-pick it on top of release-4.17 in a new PR and assign it to you.

In response to this:

/cherry-pick release-4.17

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[fbalak]

/cherry-pick release-4.16

[openshift-cherrypick-robot]

@fbalak: once the present PR merges, I will cherry-pick it on top of release-4.16 in a new PR and assign it to you.

In response to this:

/cherry-pick release-4.16

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[fbalak]

/cherry-pick release-4.15

[openshift-cherrypick-robot]

@fbalak: once the present PR merges, I will cherry-pick it on top of release-4.15 in a new PR and assign it to you.

In response to this:

/cherry-pick release-4.15

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: dahorak, DanielOsypenko, fbalak

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[openshift-cherrypick-robot]

@fbalak: new pull request created: #11201

In response to this:

/cherry-pick release-4.17

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[openshift-cherrypick-robot]

@fbalak: new pull request created: #11202

In response to this:

/cherry-pick release-4.16

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[openshift-cherrypick-robot]

@fbalak: new pull request created: #11203

In response to this:

/cherry-pick release-4.15

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