### 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)

property_info = PropertyInfo(Variant::BOOL, vformat("physics_layer_%d/polygon_%d/%s", i, j, PNAME("one_way")));
				if (physics[i].polygons[j].one_way == false) {
					property_info.usage ^= PROPERTY_USAGE_STORAGE;
				}
				p_list->push_back(property_info);
				
				property_info = PropertyInfo(Variant::FLOAT, vformat("physics_layer_%d/polygon_%d/%s", i, j, PNAME("one_way_margin")));
				if (physics[i].polygons[j].one_way_margin == 1.0) {
					property_info.usage ^= PROPERTY_USAGE_STORAGE;
				}
				p_list->push_back(property_info);
			}
		}
		
		if (terrain_set >= 0) {
			p_list->push_back(PropertyInfo(Variant::NIL, GNAME("Terrains", ""), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_GROUP));
			for (int i = 0; i < TileSet::CELL_NEIGHBOR_MAX; i++) {
				TileSet::CellNeighbor bit = TileSet::CellNeighbor(i);
				if (is_valid_terrain_peering_bit(bit)) {
					property_info = PropertyInfo(Variant::INT, "terrains_peering_bit/" + String(TileSet::CELL_NEIGHBOR_ENUM_TO_TEXT[i]));
					if (get_terrain_peering_bit(bit) == -1) {
						property_info.usage ^= PROPERTY_USAGE_STORAGE;
					}
					p_list->push_back(property_info);
				}
			}
		}
		
		p_list->push_back(PropertyInfo(Variant::NIL, GNAME("Navigation", ""), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_GROUP));
		for (int i = 0; i < navigation.size(); i++) {