### 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 (p_addon.begins_with("res:")) {
		return addon_name_to_plugin.has(p_addon);
	}
	return addon_name_to_plugin.has("res:addons/" + p_addon + "/plugin.cfg");
}
void EditorNode::_remove_edited_scene(bool p_change_tab) {
	
	hide_unused_editors(SceneTreeDock::get_singleton());
	int new_index = editor_data.get_edited_scene();
	int old_index = new_index;
	if (new_index > 0) {
		new_index = new_index - 1;
	} else if (editor_data.get_edited_scene_count() > 1) {
		new_index = 1;
	} else {
		editor_data.add_edited_scene(-1);
		new_index = 1;
	}
	if (p_change_tab) {
		_set_current_scene(new_index);
	}
	editor_data.remove_scene(old_index);
	_update_title();
	scene_tabs->update_scene_tabs();
}
void EditorNode::_remove_scene(int index, bool p_change_tab) {