Revert SyncTransport simplification and fix properly#34155

Merged

Tobion merged 2 commits intosymfony:4.4from

weaverryan:fix-sync-transport-again

Oct 31, 2019

Commits on Oct 28, 2019

Revert "[Messenger] Removing "sync" transport and replacing it with much nicer config trick"
weaverryan
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Adding ConsumedByWorkerStamp as way to mark a message in a "worker context"
weaverryan
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