[Config | Dace] Force usage of FV3_DACEMODE for orchestration

[FlorianDeconinck]

The current status of the configuration for orchestration is very fragile. This PR comes after a bad change on the default fixed here. We will now force the usage of FV3_DACEMODE by reseting the DaceConfig when we have the Communicator ready.

Details:

• Remove DaceConfig via dict (unusuable)
• Use the deffered initialization to push a DaceConfig which is controlled by FV3_DACEMODE

How Has This Been Tested?

Ran orchestrated c12 from config

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included