selftests/bpf: libarena: parallel test harness and spmc parallel selftest

Add a parallel test for the SPMC Lev-Chase workstealing queue. The queue
is built to be wait-free even when there are multiple consumers, and
the parallel selftest provides a signal on whether the queue behaves
correctly when stress tested.

To support the test, this patch includes a test harness for parallel
selftests. The spmc selftest acts as an example of the naming and other
conventions expected by the harness.

Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/r/20260605222020.5231-4-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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