### 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_2D = 0,
		EDITOR_3D,
		EDITOR_SCRIPT,
		EDITOR_ASSETLIB
	};
	enum SceneNameCasing {
		SCENE_NAME_CASING_AUTO,
		SCENE_NAME_CASING_PASCAL_CASE,
		SCENE_NAME_CASING_SNAKE_CASE
	};
	struct ExecuteThreadArgs {
		String path;
		List<String> args;
		String output;
		Thread execute_output_thread;
		Mutex execute_output_mutex;
		int exitcode = 0;
		SafeFlag done;
	};
private:
	friend class EditorSceneTabs;
	friend class SurfaceUpgradeTool;
	enum MenuOptions {