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Supersedes #868.
This adds a service for the DoctrineTransportFactory class to the messenger integration config, but doesn't tag it as transport factory. This way, there shouldn't be any errors due to the class not being present in older versions of symfony/messenger.
The tag is then added in DoctrineExtension if the class in question actually exists.
I'm not sure how to best test this since all we're checking is whether the service has a tag; this information is no longer available in the compiled container. Any suggestions?