LoomDataPlaneTest unit test is really slow #4494
Description
Describe the bug
The LoomDataPlaneTest unit test (only test in the tests component) takes >10 minutes to finish currently.
[INFO] Reactor Summary for data-plane 1.0-SNAPSHOT:
[INFO]
[INFO] data-plane ......................................... SUCCESS [01:21 min]
[INFO] contract ........................................... SUCCESS [ 4.422 s]
[INFO] core ............................................... SUCCESS [01:01 min]
[INFO] receiver ........................................... SUCCESS [ 22.549 s]
[INFO] dispatcher ......................................... SUCCESS [04:56 min]
[INFO] receiver-loom ...................................... SUCCESS [ 24.735 s]
[INFO] dispatcher-loom .................................... SUCCESS [ 21.369 s]
[INFO] benchmarks ......................................... SUCCESS [ 10.132 s]
[INFO] tests .............................................. SUCCESS [10:13 min]
Expected behavior
For unit tests which are easy to run locally and verify, I'd expect that they take a few minutes at most
To Reproduce
Run the data plane unit tests
Knative release version
Additional context
Add any other context about the problem here such as proposed priority