selftests/bpf: Add selftests for libarena buddy allocator

Introduce selftests for the buddy allocator with and without
ASAN. Add the libarena selftests both to the libarena test
runner and to test_progs, so that they are a) available when
libarena is pulled as a standalone library, and b) exercised
along with all other test programs in this directory.

ASAN for libarena requires LLVM 22. Add logic in the top-level
selftests Makefile to only compile the ASAN variant if the
compiler supports it, otherwise skip the test.

Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/r/20260426190338.4615-8-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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