### 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)

ERR_FAIL_INDEX_V(p_layer_id, physics.size(), Vector<Vector2>());
	ERR_FAIL_INDEX_V(p_polygon_index, physics[p_layer_id].polygons.size(), Vector<Vector2>());
	return physics[p_layer_id].polygons[p_polygon_index].polygon;
}
void TileData::set_collision_polygon_one_way(int p_layer_id, int p_polygon_index, bool p_one_way) {
	ERR_FAIL_INDEX(p_layer_id, physics.size());
	ERR_FAIL_INDEX(p_polygon_index, physics[p_layer_id].polygons.size());
	physics.write[p_layer_id].polygons.write[p_polygon_index].one_way = p_one_way;
	emit_signal(SNAME("changed"));
}
bool TileData::is_collision_polygon_one_way(int p_layer_id, int p_polygon_index) const {
	ERR_FAIL_INDEX_V(p_layer_id, physics.size(), false);
	ERR_FAIL_INDEX_V(p_polygon_index, physics[p_layer_id].polygons.size(), false);
	return physics[p_layer_id].polygons[p_polygon_index].one_way;
}
void TileData::set_collision_polygon_one_way_margin(int p_layer_id, int p_polygon_index, float p_one_way_margin) {
	ERR_FAIL_INDEX(p_layer_id, physics.size());
	ERR_FAIL_INDEX(p_polygon_index, physics[p_layer_id].polygons.size());
	physics.write[p_layer_id].polygons.write[p_polygon_index].one_way_margin = p_one_way_margin;
	emit_signal(SNAME("changed"));
}
float TileData::get_collision_polygon_one_way_margin(int p_layer_id, int p_polygon_index) const {
	ERR_FAIL_INDEX_V(p_layer_id, physics.size(), 0.0);
	ERR_FAIL_INDEX_V(p_polygon_index, physics[p_layer_id].polygons.size(), 0.0);
	return physics[p_layer_id].polygons[p_polygon_index].one_way_margin;
}
int TileData::get_collision_polygon_shapes_count(int p_layer_id, int p_polygon_index) const {