R1:d7c712a85585

Remove actor as a follower from unowned Asana subtasks after touching them

Summary: Ref T2852. Asana adds the actor as a follower when they create a task, so subtasks currently have up to two followers (the actor and the reviewer) when they should have only one (the reviewer). Simply removing the actor is an effective remedy for this because unfollowing tasks occurs with sneaky ninja stealth in Asana and doesn't generate notifications or even transaction activity.

Test Plan: Synchronized a revision…