Drop rosa from blocking in 4.21 and 4.20

[dgoodwin]

Removed from 4.22 lately, job is largely unmaintained and broken, we can't have patch managers getting blocked on it.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[openshift-ci-robot]

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

Note: If this PR includes changes to step registry files (ci-operator/step-registry/) and you expected jobs to be found, try rebasing your PR onto the base branch. This helps pj-rehearse accurately detect changes when the base branch has moved forward.

[openshift-ci]

@dgoodwin: The following test 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/release-controller-config	5b030c1	link	true	/test release-controller-config

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