### 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_resource->is_built_in()) {
		const String scene_path = p_resource->get_path().get_slice("::", 0);
		if (!scene_path.is_empty()) {
			save_scene_if_open(scene_path);
			return;
		}
	}
	
	String path = p_resource->get_path();
	if (path.is_resource_file() && !FileAccess::exists(path + ".import")) {
		save_resource_in_path(p_resource, p_resource->get_path());
	} else {
		save_resource_as(p_resource);
	}
}
void EditorNode::save_resource_as(const Ref<Resource> &p_resource, const String &p_at_path) {