DPL-423: Transfer::BetweenPlatesBySubmission doesn't handle deferred multiplexing decisions

[JamesGlover]

Describe the bug If the multiplexing portion of an ISC submission is part of a separate submission to the library creation portion Transfer::BetweenPlatesBySubmission fails to correctly associate the downstream aliquots with the MX requests, and instead leaves them associated with the library creation portion. This causes limber to fail to suggest further actions for the resultant plates, as the requests don't match the filters.

Rather than fixing up this behaviour, we should probably retire this class, and instead use transfer request collections in Limber.

See: https://github.com/sanger/limber/issues/1117

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