### 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
{
		String path = p_resource->get_path();
		if (!path.is_resource_file()) {
			int srpos = path.find("::");
			if (srpos != -1) {
				String base = path.substr(0, srpos);
				if (!get_edited_scene() || get_edited_scene()->get_scene_file_path() != base) {
					show_warning(TTR("This resource can't be saved because it does not belong to the edited scene. Make it unique first."));
					return;
				}
			}
		} else if (FileAccess::exists(path + ".import")) {
			show_warning(TTR("This resource can't be saved because it was imported from another file. Make it unique first."));
			return;