Add first DCP E2E test

[wolf4ood]

Feature Request

Currently in this repo we only have an E2E test using the iam.mock implementation. It would be nice to have a base for applying a series of tests using the DCP protocol as iam implementation.

Which Areas Would Be Affected?

e.g., DPF, CI, build, transfer, etc.

Why Is the Feature Desired?

Are there any requirements?

Who will sponsor this feature?

Please @-mention the committer that will sponsor your feature.

Solution Proposal

If possible, provide a (brief!) solution proposal.