Merge branch 'notify-user-space-if-any-actions-were-flushed-before-error'

Victor Nogueira says:

====================
Notify user space if any actions were flushed before error

This patch series fixes the behaviour of actions flush so that the
kernel always notifies user space whenever it deletes actions during a
flush operation, even if it didn't flush all the actions. This series
also introduces tdc tests to verify this new behaviour.
====================

Link: https://lore.kernel.org/r/20220623140742.684043-1-victor@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>