### Godot version

master

### System information

Godot v4.2.beta (0ea75d77c) - Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2070 (NVIDIA; 31.0.15.3598) - Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz (12 Threads)

### Issue description

When any of the Import, Filesystem, Node, or History docks are floating, changing an editor feature crashes the engine.
Changing any setting or selecting a different profile triggers it.

This is because `EditorNode::_feature_profile_changed` assumes the docks are in a `TabContainer`, and if they are floating they aren't in one.


### Steps to reproduce

Make any of these docks floating: Import, Filesystem, Node, or History
Open Editor Features (Editor -> Manage Editor Features...)
Make a profile (if you have none) or change a setting on the existing profile

### Minimal reproduction project

n/a
bool had_popup = get_popup();
	Popup *popup = Object::cast_to<Popup>(p_popup);
	ObjectID popup_id = popup ? popup->get_instance_id() : ObjectID();
	if (popup_obj_id == popup_id) {
		return;
	}
	popup_obj_id = popup_id;
	if (had_popup != bool(popup)) {
		queue_redraw();
		_update_margins();
		if (!get_clip_tabs()) {
			update_minimum_size();
		}
	}
}
Popup *TabContainer::get_popup() const {
	if (popup_obj_id.is_valid()) {
		Popup *popup = Object::cast_to<Popup>(ObjectDB::get_instance(popup_obj_id));
		if (popup) {
			return popup;
		} else {
#ifdef DEBUG_ENABLED
			ERR_PRINT("Popup assigned to TabContainer is gone!");
#endif
			popup_obj_id = ObjectID();
		}
	}
	return nullptr;
}
void TabContainer::set_drag_to_rearrange_enabled(bool p_enabled) {