remove assetId from POST /transferprocesses call

[ndr-brt]

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Describe the feature

Currently in the POST /transferprocesses call we're passing in the assetId, but it is currently deprecated in the APIs, as this log states:

WARNING 2024-09-24T11:43:46.794129703 The attribute https://w3id.org/edc/v0.0.1/ns/assetId has been deprecated in type https://w3id.org/edc/v0.0.1/ns/assetId, please use no attribute, as https://w3id.org/edc/v0.0.1/ns/contractId already provide such information

it can be removed, maybe first as giving it a default value and avoid to put it into the request body and mark it as deprecated (to avoid breaking changes)

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