### 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)

for (int i = 0; i < navigation_layers.size(); i++) {
		p_list->push_back(PropertyInfo(Variant::INT, vformat("navigation_layer_%d/layers", i), PROPERTY_HINT_LAYERS_2D_NAVIGATION));
	}
	
	String argt = "Any";
	for (int i = 1; i < Variant::VARIANT_MAX; i++) {
		argt += "," + Variant::get_type_name(Variant::Type(i));
	}
	p_list->push_back(PropertyInfo(Variant::NIL, GNAME("Custom Data", ""), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_GROUP));
	for (int i = 0; i < custom_data_layers.size(); i++) {
		p_list->push_back(PropertyInfo(Variant::STRING, vformat("custom_data_layer_%d/name", i)));
		p_list->push_back(PropertyInfo(Variant::INT, vformat("custom_data_layer_%d/type", i), PROPERTY_HINT_ENUM, argt));
	}
	
	
	for (const KeyValue<int, Ref<TileSetSource>> &E_source : sources) {
		p_list->push_back(PropertyInfo(Variant::INT, vformat("sources/%d", E_source.key), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
	}
	
	
	p_list->push_back(PropertyInfo(Variant::NIL, GNAME("Tile Proxies", ""), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_GROUP));
	p_list->push_back(PropertyInfo(Variant::ARRAY, PNAME("tile_proxies/source_level"), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
	p_list->push_back(PropertyInfo(Variant::ARRAY, PNAME("tile_proxies/coords_level"), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
	p_list->push_back(PropertyInfo(Variant::ARRAY, PNAME("tile_proxies/alternative_level"), PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR));
	
	for (unsigned int pattern_index = 0; pattern_index < patterns.size(); pattern_index++) {
		p_list->push_back(PropertyInfo(Variant::OBJECT, vformat("pattern_%d", pattern_index), PROPERTY_HINT_RESOURCE_TYPE, "TileMapPattern", PROPERTY_USAGE_NO_EDITOR));
	}
}
void TileSet::_validate_property(PropertyInfo &p_property) const {