USHIFT-1933: Add slack alerts to metal cache nightlies

[pacevedom]

@ggiguash

[openshift-ci-robot]

@pacevedom: This pull request references USHIFT-1933 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.15.0" version, but no target version was set.

In response to this:

@ggiguash

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[openshift-ci-robot]

[REHEARSALNOTIFIER]
@pacevedom: no rehearsable tests are affected by this change

[ggiguash]

/pj-rehearse periodic-ci-openshift-microshift-main-microshift-metal-cache-nightly

[openshift-ci-robot]

@ggiguash: job(s): periodic-ci-openshift-microshift-main-microshift-metal-cache-nightly either don't exist or were not found to be affected, and cannot be rehearsed

[ggiguash]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ggiguash, pacevedom

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• ci-operator/jobs/openshift/microshift/OWNERS [ggiguash,pacevedom]

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[pacevedom]

/pj-rehearse ack
This PR cant be rehearsed because of how dependencies are calculated. Even if it could you would only see the alert if it failed.

[openshift-ci]

@pacevedom: all tests passed!

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