Merge branch 'selftests-tc-testing-fixes-for-kselftest'

Pedro Tammela says:

====================
selftests: tc-testing: fixes for kselftest

While playing around with TuxSuite, we noticed a couple of things were
broken for strict CI/automated builds. We had a script that didn't make into
the kselftest tarball and a couple of missing Kconfig knobs in our
minimal config.
====================

Link: https://lore.kernel.org/r/20231017152309.3196320-1-pctammela@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>