Cleanup and improve ZeroMQ tests

• Remove binary file that ended up in the tree.
• Two .cpp files intended as tests were not used as such, a new test - using Catch2 - has been created out of those.
• closes #343 (closed)

added testing label

requested review from @clemenci

/ci-test

added RTA label

added ci-test-triggered label

• [2024-02-13 16:47] Validation started with lhcb-master-mr#10557

approved this merge request

resolved all threads

merged

mentioned in commit d1d8ee04