### 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 (is_layout_rtl()) {
				if (pos.x <= theme_cache.menu_icon->get_width()) {
					if (!menu_hovered) {
						menu_hovered = true;
						queue_redraw();
						return;
					}
				} else if (menu_hovered) {
					menu_hovered = false;
					queue_redraw();
				}
			} else {
				if (pos.x >= size.width - theme_cache.menu_icon->get_width()) {
					if (!menu_hovered) {
						menu_hovered = true;
						queue_redraw();
						return;
					}
				} else if (menu_hovered) {
					menu_hovered = false;
					queue_redraw();
				}
			}
			if (menu_hovered) {
				return;
			}
		}
	}
}
void TabContainer::_notification(int p_what) {