selftests/bpf: Add tests for the new type-tag based __arena identifier

Add selftests that combine the new type-based __arena identifier with
the volatile qualifier both in functions' arguments and return values.
This way we test both that they are recognized as arena arguments and
that they are not sensitive to the position they are placed in the type
compared to other qualifiers.

Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/r/20260602004120.17087-7-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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