### 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
if ((int)Input::get_singleton()->get_mouse_button_mask() & 0x7) {
				log->add_message(TTR("Can't undo while mouse buttons are pressed."), EditorLog::MSG_TYPE_EDITOR);
			} else {
				EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
				String action = undo_redo->get_current_action_name();
				int id = undo_redo->get_current_action_history_id();
				if (!undo_redo->undo()) {
					log->add_message(TTR("Nothing to undo."), EditorLog::MSG_TYPE_EDITOR);
				} else if (!action.is_empty()) {
					switch (id) {
						case EditorUndoRedoManager::GLOBAL_HISTORY:
							log->add_message(vformat(TTR("Global Undo: %s"), action), EditorLog::MSG_TYPE_EDITOR);
							break;
						case EditorUndoRedoManager::REMOTE_HISTORY:
							log->add_message(vformat(TTR("Remote Undo: %s"), action), EditorLog::MSG_TYPE_EDITOR);
							break;
						default:
							log->add_message(vformat(TTR("Scene Undo: %s"), action), EditorLog::MSG_TYPE_EDITOR);
					}
				}
			}
		} break;
		case EDIT_REDO: {
			EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
			if ((int)Input::get_singleton()->get_mouse_button_mask() & 0x7) {
				log->add_message(TTR("Can't redo while mouse buttons are pressed."), EditorLog::MSG_TYPE_EDITOR);
			} else {
				if (!undo_redo->redo()) {
					log->add_message(TTR("Nothing to redo."), EditorLog::MSG_TYPE_EDITOR);
				} else {