[OPR-197]: GroupOperation which produces operation now gets added to group
[OPR-197]: GroupOperation which produces operation now gets added to group

When an operation is added to a queue, we add an observer for if it calls produce operation. Previously this operation would just be added to the same queue. However, it makes sense that if a GroupOperation calls produce operation, it actually is just added to the the group.

cezarywojcik/Operations,danthorpe/Operations,blg-andreasbraun/Operations,blg-andreasbraun/ProcedureKit,ProcedureKit/ProcedureKit,ProcedureKit/ProcedureKit,blg-andreasbraun/Operations,blg-andreasbraun/Operations,cezarywojcik/Operations,blg-andreasbraun/ProcedureKit,danthorpe/Operations,ProcedureKit/ProcedureKit,danthorpe/Operations,blg-andreasbraun/ProcedureKit,cezarywojcik/Operations