### 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 (EDITOR_GET("interface/editor/separate_distraction_mode")) {
		int screen = -1;
		for (int i = 0; i < editor_table.size(); i++) {
			if (editor_plugin_screen == editor_table[i]) {
				screen = i;
				break;
			}
		}
		if (screen == EDITOR_SCRIPT) {
			script_distraction_free = !script_distraction_free;
			set_distraction_free_mode(script_distraction_free);
		} else {
			scene_distraction_free = !scene_distraction_free;
			set_distraction_free_mode(scene_distraction_free);
		}
	} else {
		set_distraction_free_mode(distraction_free->is_pressed());
	}
}
void EditorNode::set_distraction_free_mode(bool p_enter) {
	distraction_free->set_pressed(p_enter);
	if (p_enter) {
		if (docks_visible) {
			set_docks_visible(false);
		}
	} else {
		set_docks_visible(true);
	}
}
bool EditorNode::is_distraction_free_mode_enabled() const {