### 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
Array rc = EditorSettings::get_singleton()->get_project_metadata("recent_files", "scenes", Array());
	recent_scenes->clear();
	String path;
	for (int i = 0; i < rc.size(); i++) {
		path = rc[i];
		recent_scenes->add_item(path.replace("res:", ""), i);
	}
	recent_scenes->add_separator();
	recent_scenes->add_shortcut(ED_SHORTCUT("editor/clear_recent", TTR("Clear Recent Scenes")));
	recent_scenes->reset_size();
}
void EditorNode::_quick_opened() {
	Vector<String> files = quick_open->get_selected_files();
	bool open_scene_dialog = quick_open->get_base_type() == "PackedScene";
	for (int i = 0; i < files.size(); i++) {
		String res_path = files[i];
		if (open_scene_dialog || ClassDB::is_parent_class(ResourceLoader::get_resource_type(res_path), "PackedScene")) {
			open_request(res_path);
		} else {
			load_resource(res_path);
		}
	}
}
void EditorNode::_project_run_started() {