### Godot version

v4.0.3.stable.mono.official [5222a99f5]

### System information

macOS Monterey 12.6.6 (21G646)

### Issue description

When creating a tileset by code with custom data layers, removing a layer with `remove_custom_data_layer` does not update the name-to-layer mapping; `get_custom_data_layer_by_name` will continue to return that layer's original index.

This has a downstream effect of causing TileData objects attempting to use `get_custom_data('Layer B')` to return invalid data (whatever custom data is now in Layer B's old index; e.g. Layer C).

I would expect that after using `remove_custom_data_layer`, I would be able to still use `get_custom_data_layer_by_name` on that tileset.

### Steps to reproduce

Run this code to see that getting Layer B by name after removing the first layer continues to return its original index (1) when in reality it is now at index 0.
```
	var tileset:TileSet = TileSet.new()

	tileset.add_custom_data_layer()
	tileset.set_custom_data_layer_name(0, 'Layer A')
	tileset.set_custom_data_layer_type(0, TYPE_INT)

	tileset.add_custom_data_layer()
	tileset.set_custom_data_layer_name(1, 'Layer B')
	tileset.set_custom_data_layer_type(1, TYPE_STRING)

	print('Layer index 0 name : ', tileset.get_custom_data_layer_name(0)) # Layer A
	print('Layer index 1 name : ', tileset.get_custom_data_layer_name(1)) # Layer B
	print('Layer B is on index : ', tileset.get_custom_data_layer_by_name("Layer B")) # 1

	print('----- removing custom data layer 0 -----')
	tileset.remove_custom_data_layer(0)

	print('Layer index 0 name : ', tileset.get_custom_data_layer_name(0)) # Layer B
	print('Layer index 1 name : ', tileset.get_custom_data_layer_name(1)) # prints an error, as expected
	print('Layer B is on index : ', tileset.get_custom_data_layer_by_name("Layer B")) # returns 1 still! should return 0.
```

### Minimal reproduction project

[RemoveCustomDataLayer.zip](https://github.com/godotengine/godot/files/11804762/RemoveCustomDataLayer.zip)

PropertyInfo property_info;
	
	if (tile_set) {
		
		p_list->push_back(PropertyInfo(Variant::NIL, GNAME("Rendering", ""), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_GROUP));
		for (int i = 0; i < occluders.size(); i++) {
			
			property_info = PropertyInfo(Variant::OBJECT, vformat("occlusion_layer_%d/%s", i, PNAME("polygon")), PROPERTY_HINT_RESOURCE_TYPE, "OccluderPolygon2D", PROPERTY_USAGE_DEFAULT);
			if (!occluders[i].is_valid()) {
				property_info.usage ^= PROPERTY_USAGE_STORAGE;
			}
			p_list->push_back(property_info);
		}
		
		p_list->push_back(PropertyInfo(Variant::NIL, GNAME("Physics", ""), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_GROUP));
		for (int i = 0; i < physics.size(); i++) {
			p_list->push_back(PropertyInfo(Variant::VECTOR2, vformat("physics_layer_%d/%s", i, PNAME("linear_velocity")), PROPERTY_HINT_NONE));
			p_list->push_back(PropertyInfo(Variant::FLOAT, vformat("physics_layer_%d/%s", i, PNAME("angular_velocity")), PROPERTY_HINT_NONE));
			p_list->push_back(PropertyInfo(Variant::INT, vformat("physics_layer_%d/%s", i, PNAME("polygons_count")), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_EDITOR));
			for (int j = 0; j < physics[i].polygons.size(); j++) {
				
				property_info = PropertyInfo(Variant::ARRAY, vformat("physics_layer_%d/polygon_%d/%s", i, j, PNAME("points")), PROPERTY_HINT_ARRAY_TYPE, "Vector2", PROPERTY_USAGE_DEFAULT);
				if (physics[i].polygons[j].polygon.is_empty()) {
					property_info.usage ^= PROPERTY_USAGE_STORAGE;
				}
				p_list->push_back(property_info);