selftests/bpf: Run arena tests serially

Every arena reserves a 4GB kernel vmalloc region at creation, and on a
KASAN build that eagerly populates ~512MB of shadow memory per arena. When
several arena tests run in parallel their shadow adds up, exhausts the
memory of a small CI VM and trips the OOM killer during map creation.

Make the dedicated arena tests (arena_* and libarena*) serial so they no
longer pile up in the parallel phase. That alone brings the peak number of
live arenas back within the CI memory budget.

A few other tests such as verifier_arena*, stream and compute_live_registers
create an arena too, but they run inside shared RUN_TESTS()/RUN() suites, so
turning them serial would drag many unrelated subtests along with them.
Leave those as-is.

Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/bpf/20260717114117.350851-4-jiayuan.chen@linux.dev
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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