behaviour_manager is not deactivating nodes before activating everytime

[PositiveBeat]

Description of the bug

Package: `behaviour_manager

Tested with launching robot.launch.py in vision_bringup, with lifecycle_talker added to list of nodes to manage.

In terminal 1:

ros2 launch vision_bringup robot.launch.py use_mock_camera:=true 

In terminal 2:

ros2 run behaviour_manager lifecycle_talker

Using RQT to call the /activate_node service, first face_following_node, then lifecycle_talker, and back to face_following_node. When changing back to face_following_node, lifecycle_talker is not deactivated.