### 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)

#ifndef DISABLE_DEPRECATED
	if (p_name == "texture_offset") {
		r_ret = texture_origin;
		return true;
	}
#endif
	Vector<String> components = String(p_name).split("/", true, 2);
	if (tile_set) {
		if (components.size() == 2 && components[0].begins_with("occlusion_layer") && components[0].trim_prefix("occlusion_layer_").is_valid_int()) {
			
			int layer_index = components[0].trim_prefix("occlusion_layer_").to_int();
			ERR_FAIL_COND_V(layer_index < 0, false);
			if (layer_index >= occluders.size()) {
				return false;
			}
			if (components[1] == "polygon") {
				r_ret = get_occluder(layer_index);
				return true;
			}
		} else if (components.size() >= 2 && components[0].begins_with("physics_layer_") && components[0].trim_prefix("physics_layer_").is_valid_int()) {
			
			int layer_index = components[0].trim_prefix("physics_layer_").to_int();
			ERR_FAIL_COND_V(layer_index < 0, false);
			if (layer_index >= physics.size()) {
				return false;
			}
			if (components.size() == 2) {
				if (components[1] == "linear_velocity") {