Update Backend Service to EDC 0.7.0

[ieuna]

Previously "initiate transfer" was using receiverHttpEndpoint to send EDR to backend service. This is now deprecated.

• Add "callbackAddresses" in "initiate transfer" request.
• Update backend service to process TransferProcessStarted event triggered after "initiate transfer" request.

[ieuna]

Addressed in PR: https://github.com/eclipse-tractusx/tutorial-resources/pull/417