Fix quorum queue queue federation bugs #8282
Merged
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Quorum queues would due to a misunderstanding whilst porting queue decorators from classic queues calculate the wrong maximum consumer priority leading to strange behaviour when using queue federation.
Also notify decorators on startup. In this case we had to do this when a member becomes leader which isn't always at startup so will have to rely on the mirroried supervisor to ensure we don't start multiple federation links.