selftests/bpf: Test arena binding by libbpf

Attach a struct_ops callback with an __arena argument from an object
whose callback and unrelated program never refer to the arena, drive it
through the kernel, and check that an unrelated program of the object
got the arena among its maps as well. Load the same object through
bpf_object__prepare() and bpf_program__clone() too, the way veristat
loads programs.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20261019132203.3034698-13-memxor@gmail.com

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