Resolve incomplete CDR separation from DKG module

## Description and context

The recent refactor moved threshold decryption operations (VaultRead, SubmitEncryptedPartialDecryption) from the DKG contract to a dedicated CDR contract. During this separation, several references were not fully updated. 


## Suggested solution

- Update DKG module to handle CDR operations separately

## Definition of done

- All updates and code compiles successfully