selftests/bpf: Cover __uninit kfunc output argument slots

Keep coverage for per-slot output tracking separate from the immediate
single-output regression tests. Check that both constant-size outputs are
initialized, and that a variable-size output does not disable initialization
of an independent constant-size output.

Also exercise an output following a by-value parameter that occupies two
argument slots, and an output pointer passed on the stack. Run each case
with normal capabilities and with CAP_BPF and CAP_NET_ADMIN only. Leave the
stack-passed output uninitialized so its reduced-capability case fails if
the verifier treats it as an ordinary input buffer.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20260921023843.411943-8-memxor@gmail.com

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