### 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
return tab_closing_menu_option == FILE_QUIT || tab_closing_menu_option == RUN_PROJECT_MANAGER || tab_closing_menu_option == RELOAD_CURRENT_PROJECT;
}
void EditorNode::_scene_tab_closed(int p_tab) {
	current_menu_option = SCENE_TAB_CLOSE;
	tab_closing_idx = p_tab;
	Node *scene = editor_data.get_edited_scene_root(p_tab);
	if (!scene) {
		_discard_changes();
		return;
	}
	String scene_filename = scene->get_scene_file_path();
	String unsaved_message;
	if (EditorUndoRedoManager::get_singleton()->is_history_unsaved(editor_data.get_scene_history_id(p_tab))) {
		if (scene_filename.is_empty()) {
			unsaved_message = TTR("This scene was never saved.");
		} else {
			
			
			
			const uint64_t last_modified_seconds = Time::get_singleton()->get_unix_time_from_system() - MAX(started_timestamp, FileAccess::get_modified_time(scene->get_scene_file_path()));
			String last_modified_string;
			if (last_modified_seconds < 120) {
				last_modified_string = vformat(TTRN("%d second ago", "%d seconds ago", last_modified_seconds), last_modified_seconds);
			} else if (last_modified_seconds < 7200) {