enable olm Slack channel notifications from olm jobs

[jianzhangbjz]

As the title shows, add the olm Slack channel configuration. Related to: #71503

[openshift-ci-robot]

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

[jianzhangbjz]

/pj-rehearse periodic-ci-openshift-eng-ocp-qe-perfscale-ci-main-gcp-4.20-nightly-x86-olmv1-benchmark-test

[openshift-ci-robot]

@jianzhangbjz: now processing your pj-rehearse request. Please allow up to 10 minutes for jobs to trigger or cancel.

[openshift-ci-robot]

@jianzhangbjz: job(s): periodic-ci-openshift-eng-ocp-qe-perfscale-ci-main-gcp-4.20-nightly-x86-olmv1-benchmark-test either don't exist or were not found to be affected, and cannot be rehearsed

[qiliRedHat]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jianzhangbjz, qiliRedHat

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[openshift-ci]

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