net: net_test: add tests for TCP re-segmentation

The GSO engine can now be asked to group several MSS segments into one
output skb, which is what re-segmentation needs.  Add KUnit coverage for
the max_segs parameter.

The parameterized GSO test gains a max_segs input and four cases: a limit
of two MSS applied to a 3003 byte and to a 5003 byte payload, a tail which
holds one MSS and is therefore not a GSO skb, and a max_segs of one MSS
which must leave the output unchanged.  It drives skb_segment() directly,
because the synthetic protocol it uses has no gso_segment callback.

Assisted-by: LLM
Signed-off-by: Wang Zhan <wang.zhan@smartx.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20261008100651.2534957-7-wang.zhan@smartx.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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