selftests/landlock: Test abstract socket trace name limits

The landlock_deny_scope_abstract_unix_socket event captures binary
socket names with __string_len(), whose dynamic field reserves an extra
byte for the NUL terminator.  The printer subtracts this byte before
escaping the content.

Exercise the minimum accepted address length, which has no name content,
and the maximum sockaddr_un length, which has 107 content bytes.  Check
the exact trace output at both boundaries.  The existing stream and
datagram variants share this event, so the boundary variants only need
the stream path.

Because these boundary names are fixed, run the fixture in a private
network namespace.  Abstract UNIX socket names are scoped by network
namespace, preventing concurrent bind() calls from colliding.

The lower-bound test confirms that the subtraction recovers zero instead
of underflowing.

Cc: Günther Noack <gnoack@google.com>
Link: https://patch.msgid.link/CAL4aGcVcT0VWVFmGi_vLqxxZ9KdOHfGXYZtKjBdvoUyFjbu5=A@mail.gmail.com
Link: https://patch.msgid.link/20260907103503.109461-1-mic@digikod.net
Signed-off-by: Mickaël Salaün <mic@digikod.net>

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