### 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
HashMap<String, int> scene_name_to_set_index;
	for (int i = 0; i < r_filenames.size(); i++) {
		String scene_name = r_filenames[i];
		if (!scene_name_to_set_index.has(scene_name)) {
			index_sets.append(RBSet<int>());
			scene_name_to_set_index.insert(r_filenames[i], index_sets.size() - 1);
		}
		index_sets.write[scene_name_to_set_index[scene_name]].insert(i);
	}
	
	for (int i = 0; i < index_sets.size(); i++) {
		RBSet<int> iset = index_sets[i];
		while (iset.size() > 1) {
			
			for (const int &E : iset) {
				int set_idx = E;
				String scene_name = r_filenames[set_idx];
				String full_path = p_full_paths[set_idx];
				
				scene_name = scene_name.get_basename();
				if (full_path.begins_with("res:")) {
					full_path = full_path.substr(6);
				}
				full_path = full_path.get_basename();
				
				scene_name = scene_name.trim_suffix("/");
				full_path = full_path.trim_suffix("/");
				int scene_name_size = scene_name.size();
				int full_path_size = full_path.size();
				int difference = full_path_size - scene_name_size;