### 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
class DependencyEditor;
class DependencyErrorDialog;
class DynamicFontImportSettings;
class EditorAbout;
class EditorBuildProfileManager;
class EditorCommandPalette;
class EditorExport;
class EditorExtensionManager;
class EditorFeatureProfileManager;
class EditorFileDialog;
class EditorFolding;
class EditorInspector;
class EditorLayoutsDialog;
class EditorLog;
class EditorNativeShaderSourceVisualizer;
class EditorPluginList;
class EditorQuickOpen;
class EditorPropertyResource;
class EditorResourcePreview;
class EditorResourceConversionPlugin;
class EditorRunBar;
class EditorRunNative;
class EditorSceneTabs;
class EditorSelectionHistory;
class EditorSettingsDialog;
class EditorTitleBar;
class EditorToaster;
class EditorUndoRedoManager;
class ExportTemplateManager;
class FBXImporterManager;