### 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
return tab_bar->is_tab_hidden(p_tab);
}
void TabContainer::set_tab_metadata(int p_tab, const Variant &p_metadata) {
	tab_bar->set_tab_metadata(p_tab, p_metadata);
}
Variant TabContainer::get_tab_metadata(int p_tab) const {
	return tab_bar->get_tab_metadata(p_tab);
}
void TabContainer::set_tab_button_icon(int p_tab, const Ref<Texture2D> &p_icon) {
	tab_bar->set_tab_button_icon(p_tab, p_icon);
	_update_margins();
	_repaint();
}
Ref<Texture2D> TabContainer::get_tab_button_icon(int p_tab) const {
	return tab_bar->get_tab_button_icon(p_tab);
}
Size2 TabContainer::get_minimum_size() const {
	Size2 ms;