[CONTRACT_MGMT][BACKEND] Unable to receive data from EDC for contract information

[ds-lcapellino]

Description

Due to the EDC 0.7.0 migration, the contract view in the FE shows many null values. However, this functionality worked in the past with EDC 0.5.3.

Current behavior

• No data are loaded in contract view, except the contractAgreementId.

Expected behavior

• Information provided by EDC Management API are shown for contractAgreementId.
• Error is shown if no data could be located over EDC Mgmt API for contractAgreementId

Out of scope

• End date is not shown

Steps to reproduce the Bug

• Login with role admin
• Open Contract View
• Browse through table

[ds-lcapellino]

With the EDC version 0.7.0, the prefix "edc:" got removed int the contract agreement response.
How contract agreement were returned in EDC 0.5.3:
[ { "@type" : "edc:ContractAgreement", "@id" : "abc1", "edc:assetId" : "registry-asset", "edc:policy" : { ...
How they are returned in 0.7.0:
[ { "@type": "ContractAgreement", "@id": "047c1046-2fca-4597-85d5-ebf5bed806e9", "assetId": "registry-asset", "policy": { ...

We will fix this in the edc-client-lib.

[ds-lcapellino]

Issue is solved with #983.
Verified on E2E environment.

[ds-crehm]

Tested on E2E-A & E2E-B:
Contract details are visible again including contract id, counterparty address, creation date, state and raw json data.
Ready for review.

[mkanal]

LGFM. PO Accpetance in behalf of @jzbmw.