Fix AnimatableBody3D not being movable in editor

[aXu-AP]

Fixes #72416

This bug was introduced in #67847, which enables transform notifications in editor for collision objects, but AnimatableBody3D has logic in place which reverts the position. The proposed solution is to disable AnimatableBody3D's handling of notifications when running in editor.

Here's the relevant snippets that causes the problem in the first place:

godot/scene/3d/collision_object_3d.cpp

Lines 47 to 49 in 0810eca

	if (Engine::get_singleton()->is_editor_hint()) {
	set_notify_local_transform(true); // Used for warnings and only in editor.
	}

godot/scene/3d/physics_body_3d.cpp

Lines 347 to 358 in 0810eca

	case NOTIFICATION_LOCAL_TRANSFORM_CHANGED: {
	// Used by sync to physics, send the new transform to the physics...
	Transform3D new_transform = get_global_transform();
	PhysicsServer3D::get_singleton()->body_set_state(get_rid(), PhysicsServer3D::BODY_STATE_TRANSFORM, new_transform);
	// ... but then revert changes.
	set_notify_local_transform(false);
	set_global_transform(last_valid_transform);
	set_notify_local_transform(true);
	_on_transform_changed();
	} break;

[rburing]

Thanks for catching this oversight!

[aXu-AP]

I was trying to fix entirely different bug earlier today which touches the same bits of code (I presume, haven't yet succeeded), so I could connect the dots once I saw this issue 😅

[akien-mga]

Thanks!