2.x: fix Maybe.concat() subscribe-after-cancel, verify others #5101
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This PR fixes
Maybe.concatXsubscribing to the next source when the downstream cancelled theFlowablesequence from itsonNext. This resulted in executing the subscription side-effects of the source to be immediately cancelled when it calledonSubscribeon concat'sMaybeObserver.In addition, tests were added to verify the other types don't have this kind of a problem.
Related #5100.