### 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
String rendering_method = renderer->get_item_metadata(p_which);
	String current_renderer = GLOBAL_GET("rendering/renderer/rendering_method");
	if (rendering_method == current_renderer) {
		return;
	}
	renderer_request = rendering_method;
	video_restart_dialog->popup_centered();
	renderer->select(renderer_current);
	_update_renderer_color();
}
void EditorNode::_resource_saved(Ref<Resource> p_resource, const String &p_path) {
	if (singleton->saving_resources_in_path.has(p_resource)) {
		
		return;
	}
	if (EditorFileSystem::get_singleton()) {
		EditorFileSystem::get_singleton()->update_file(p_path);
	}
	singleton->editor_folding.save_resource_folding(p_resource, p_path);
}
void EditorNode::_resource_loaded(Ref<Resource> p_resource, const String &p_path) {