entity.remove_component can't trigger observer on_component_removed

[LuckyXixi]

GECS Version

5.1.0

What happened?

In entity.gd:166 component_removed.emit(self, component_instance) emit component_instance which resource_path is null.
Therefore in world.gd:898 if watch_component and watch_component.resource_path == component.resource_path is always false.

Wonder this should be correct: entity.gd:166 component_removed.emit(self, component)

Steps to Reproduce

1. add entity and observer
2. add component
3. remove component
4. observe observer on_component_removed never run

[csprance]

Hey I will take a peek at this soon. I would also accept a PR as well.