origin.spec: add openshift-diagnostics

[sosiouxme]

One method of fixing #18141 -- add the binary into the origin RPM so it gets into the images.

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sosiouxme
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[openshift-ci-robot]

@sosiouxme: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/openshift-jenkins/extended_networking_minimal	b55c922	link	/test extended_networking_minimal
ci/openshift-jenkins/extended_conformance_gce	b55c922	link	/test extended_conformance_gce
ci/openshift-jenkins/end_to_end	b55c922	link	/test end_to_end
ci/openshift-jenkins/extended_conformance_install	b55c922	link	/test extended_conformance_install

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[sosiouxme]

Prefer to add sub-command(s) instead of packaging this binary.