chore: add eBPF unit tests

[gruyaume]

Description

Add unit tests for our BPF program leveraging BPF_PROG_TEST_RUN, which allows to run a loaded eBPF program in the kernel with a supplied input and records the output.

Reference

• https://docs.ebpf.io/linux/syscall/BPF_PROG_TEST_RUN/

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that validate the behaviour of the software
• I validated that new and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules