Allow hypo generators to return CAs

Merged Tomasz Bold requested to merge tbold/athena:rel23-hypo-gen-makes-ca into 23.0

This MR allows chains in new JO menu to also be decorated by event building steps. The use of this functionality is not happening yet. But I would like to give you a preview. I am not sure if I should be using isCAMenu() or ConfigurableCABehavior() switch. @fwinkl @fpastore

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