### 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
EDITOR_DEF("interface/inspector/horizontal_vector2_editing", false);
	EDITOR_DEF("interface/inspector/horizontal_vector_types_editing", true);
	EDITOR_DEF("interface/inspector/open_resources_in_current_inspector", true);
	PackedStringArray open_in_new_inspector_defaults;
	
	open_in_new_inspector_defaults.push_back("Script");
	
	open_in_new_inspector_defaults.push_back("MeshLibrary");
	EDITOR_DEF("interface/inspector/resources_to_open_in_new_inspector", open_in_new_inspector_defaults);
	EDITOR_DEF("interface/inspector/default_color_picker_mode", 0);
	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::INT, "interface/inspector/default_color_picker_mode", PROPERTY_HINT_ENUM, "RGB,HSV,RAW,OKHSL", PROPERTY_USAGE_DEFAULT));
	EDITOR_DEF("interface/inspector/default_color_picker_shape", (int32_t)ColorPicker::SHAPE_OKHSL_CIRCLE);
	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::INT, "interface/inspector/default_color_picker_shape", PROPERTY_HINT_ENUM, "HSV Rectangle,HSV Rectangle Wheel,VHS Circle,OKHSL Circle", PROPERTY_USAGE_DEFAULT));
	ED_SHORTCUT("canvas_item_editor/pan_view", TTR("Pan View"), Key::SPACE);
	const Vector<String> textfile_ext = ((String)(EDITOR_GET("docks/filesystem/textfile_extensions"))).split(",", false);
	for (const String &E : textfile_ext) {
		textfile_extensions.insert(E);
	}
	resource_preview = memnew(EditorResourcePreview);
	add_child(resource_preview);
	progress_dialog = memnew(ProgressDialog);
	progress_dialog->set_unparent_when_invisible(true);
	gui_base = memnew(Panel);
	add_child(gui_base);
	
	gui_base->set_anchors_and_offsets_preset(Control::PRESET_FULL_RECT);
	gui_base->set_anchor(SIDE_RIGHT, Control::ANCHOR_END);
	gui_base->set_anchor(SIDE_BOTTOM, Control::ANCHOR_END);
	gui_base->set_end(Point2(0, 0));
	main_vbox = memnew(VBoxContainer);