feat: add compatibility tests for DSP

[paullatzelsperger]

What this PR changes/adds

This PR adds a compatibility test for DSP.

The Technology compatibility Kit (TCK) is spun up in a Docker container and executed against a connector instance.

Note that two things are necessary to achieve that:

1. a test fixture: a connector that contains an special extension to seed test data and expose a trigger endpoint. This is located at system-tests/dsp-compatibility-tests/connector-under-test. The fixture will come in a subsequent PR!
2. a test harness: a TCK instance running in Docker. This is achieved using Testcontainers, and a configuration file located at system-tests/dsp-compatibility-tests/compatibility-test-runner/src/test/resources/docker.tck.properties

Why it does that

to guarantee compatibility with DSP

Further notes

• the test is currently disabled, because there appear to be bugs in the DSP impl. of EDC
• the test should not be executed during normal CI runs due to the impact it has on test runtime. With this PR, it is run in a nightly build job.
• we might consider publishing the test fixture as Maven artifact in the future. That'll be a separate work item though.

Linked Issue(s)

Closes # <-- insert Issue number if one exists

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[ndr-brt]

cool stuff!