test/extended/operators: skip 'OLM can subscribe to the operator' if redhat-operators source is not enabled
test/extended/operators: skip 'OLM can subscribe to the operator' if redhat-operators source is not enabled

OKD has only community-operators so this test mistakenly fails there. The first step would be
to disable it there. Once amq-stream would be
available as a community operator, I'll rework the
test to use a different source instead

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