Transfer support for Cosmos3 ModularPipeline (#14150)
* Add transfer support to the Cosmos3 modular pipeline
* Convention matches fixes
* Align Cosmos3 transfer blocks with modular conventions
* Move Cosmos3TransferSetupStep to before_encoder.py
* Decouple Cosmos3 transfer blocks from task-pipeline internals
* Temporarily disable standalone transfer workflow
* Auto docstring run fix
* Apply style fixes
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