Merge branch 'netdevsim-add-fake-ft-cls_flower-offload'

Florian Westphal says:

====================
netdevsim: add fake FT/CLS_FLOWER offload

v2: fix up error reporting via extack
    shellcheck cleanups
    sort config toggles

1) Enable nf_tables offload control plane testing in netdevsim. Tag
   existing offload fn to allow error injection for testing rollback and abort
   logic.

2) Add nft_offload selftest to exercise the control plane and error
   unwind via fault injection.
====================

Link: https://patch.msgid.link/20260612092209.11966-1-fw@strlen.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>