selftests: bpf: test non-sleepable arena allocations

As arena kfuncs can now be called from non-sleepable contexts, test this
by adding non-sleepable copies of tests in verifier_arena, this is done
by using a socket program instead of syscall.

Add a new test case in verifier_arena_large to check that the
bpf_arena_alloc_pages() works for more than 1024 pages.
1024 * sizeof(struct page *) is the upper limit of kmalloc_nolock() but
bpf_arena_alloc_pages() should still succeed because it re-uses this
array in a loop.

Augment the arena_list selftest to also run in non-sleepable context by
taking rcu_read_lock.

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20251222195022.431211-5-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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