### 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)

if (components.size() < 2) {
			return false;
		}
		String what = components[1];
		if (what == "name") {
			ctd->name = p_value;
		} else if (what == "texture") {
			ctd->texture = p_value;
		} else if (what == "tex_offset") {
			ctd->tex_offset = p_value;
		} else if (what == "material") {
			ctd->material = p_value;
		} else if (what == "modulate") {
			ctd->modulate = p_value;
		} else if (what == "region") {
			ctd->region = p_value;
		} else if (what == "tile_mode") {
			ctd->tile_mode = p_value;
		} else if (what.left(9) == "autotile") {
			what = what.substr(9);
			if (what == "bitmask_mode") {
				ctd->autotile_bitmask_mode = p_value;
			} else if (what == "icon_coordinate") {
				ctd->autotile_icon_coordinate = p_value;
			} else if (what == "tile_size") {
				ctd->autotile_tile_size = p_value;
			} else if (what == "spacing") {
				ctd->autotile_spacing = p_value;
			} else if (what == "bitmask_flags") {
				if (p_value.is_array()) {