tls: remove dead sockmap (psock) handling from the SW path

TLS and sockmap are now mutually exclusive. Try to delete the code
from sendmsg and recvmsg path which is now obviously dead.

The main goal is to delete enough code for AI security scanners
to no longer bother us with sockmap related bugs. At the same
time retain the code in case someone has the cycles to fix
all of this and make the integration work, again.

If the integration does not get restored we can wipe the rest
of the skmsg code from TLS in two or three releases.

The changes on the Tx side are deeper since that's where most
of the bugs are, Rx side simply takes the data from sockmap
and gives it to the user. On Tx split record handling and
rolling back the iterator were the two problem areas.

Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://patch.msgid.link/20260614014102.461064-3-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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