### 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)

}
					p.pop_front();
				}
			}
		} else if (what == "shapes") {
			Array p = p_value;
			for (int i = 0; i < p.size(); i++) {
				CompatibilityShapeData csd;
				Dictionary d = p[i];
				for (int j = 0; j < d.size(); j++) {
					String key = d.get_key_at_index(j);
					if (key == "autotile_coord") {
						csd.autotile_coords = d[key];
					} else if (key == "one_way") {
						csd.one_way = d[key];
					} else if (key == "one_way_margin") {
						csd.one_way_margin = d[key];
					} else if (key == "shape") {
						csd.shape = d[key];
					} else if (key == "shape_transform") {
						csd.transform = d[key];
					}
				}
				ctd->shapes.push_back(csd);
			}
		} else if (what == "occluder") {
			ctd->occluder = p_value;
		} else if (what == "navigation") {
			ctd->navigation = p_value;
			/*