selftests/bpf: Test kfunc argument diagnostics

Extend existing negative kfunc programs to assert that BTF void is rendered
as void and that variable __szk arguments receive a structured constant-size
diagnostic.

Also pass a context pointer to bpf_refcount_acquire() and verify that the
report describes the generic refcounted-object contract and the actual
argument type. Retain the legacy verbose-message assertions.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/3eda33675965763aa9b2e6a5784f32b34a6a83988a55fbea98b0dbd0cf3b088d@mail.kernel.org
Link: https://lore.kernel.org/bpf/20260816015746.2632990-8-memxor@gmail.com

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