feat: Add the ability to un-assign teams using automation (#9668)

Co-authored-by: Pranav <pranavrajs@gmail.com>

app/services/action_service.rb

@@ -50,7 +50,11 @@ class ActionService
   end
 
   def assign_team(team_ids = [])
-    return unassign_team if team_ids[0]&.zero?
+    # FIXME: The explicit checks for zero or nil (string) is bad. Move
+    # this to a separate unassign action.
+    should_unassign = team_ids.blank? || %w[nil 0].include?(team_ids[0].to_s)
+    return @conversation.update!(team_id: nil) if should_unassign
+
     # check if team belongs to account only if team_id is present
     # if team_id is nil, then it means that the team is being unassigned
     return unless !team_ids[0].nil? && team_belongs_to_account?(team_ids)