add multi-pr presubmit testing

[weshayutin]

https://docs.ci.openshift.org/docs/how-tos/multi-pr-presubmit-testing/
Not 100% sure this will be useful to OADP unless we can build the containers from the other repos and create the override

• @mpryc FYI.. some to chat about when ur back

[weshayutin]

/hold

[openshift-ci]

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[openshift-ci-robot]

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

[openshift-ci]

@weshayutin: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/prow-config	c8b84b9	link	true	/test prow-config
ci/prow/config	c8b84b9	link	true	/test config

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