endpoint: Remove eventual old backup directory
endpoint: Remove eventual old backup directory

An eventual old backup directory that survived because the agent crashed in the
middle of a regeneration may lead to undefined behavior. It is safe to remove
the backup directory unconditionally.

Signed-off-by: Thomas Graf <5f50a84c1fa3bcff146405017f36aec1a10a9e38@cilium.io>

scanf/cilium,cilium-team/cilium,tgraf/cilium,cilium/cilium,scanf/cilium,scanf/cilium,cilium/cilium,tgraf/cilium,scanf/cilium,cilium/cilium,scanf/cilium,tklauser/cilium,tgraf/cilium,tgraf/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,tgraf/cilium,cilium/cilium,tklauser/cilium,tklauser/cilium,cilium-team/cilium,tklauser/cilium,michi-covalent/cilium,scanf/cilium,michi-covalent/cilium,tgraf/cilium,scanf/cilium,michi-covalent/cilium,michi-covalent/cilium