### 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_COND_V(!is_valid_terrain_peering_bit(p_peering_bit), -1);
	return terrain_peering_bits[p_peering_bit];
}
bool TileData::is_valid_terrain_peering_bit(TileSet::CellNeighbor p_peering_bit) const {
	ERR_FAIL_COND_V(!tile_set, false);
	return tile_set->is_valid_terrain_peering_bit(terrain_set, p_peering_bit);
}
TileSet::TerrainsPattern TileData::get_terrains_pattern() const {
	ERR_FAIL_COND_V(!tile_set, TileSet::TerrainsPattern());
	TileSet::TerrainsPattern output(tile_set, terrain_set);
	output.set_terrain(terrain);
	for (int i = 0; i < TileSet::CELL_NEIGHBOR_MAX; i++) {
		if (tile_set->is_valid_terrain_peering_bit(terrain_set, TileSet::CellNeighbor(i))) {
			output.set_terrain_peering_bit(TileSet::CellNeighbor(i), get_terrain_peering_bit(TileSet::CellNeighbor(i)));
		}
	}
	return output;
}
void TileData::set_navigation_polygon(int p_layer_id, Ref<NavigationPolygon> p_navigation_polygon) {
	ERR_FAIL_INDEX(p_layer_id, navigation.size());
	navigation.write[p_layer_id] = p_navigation_polygon;
	emit_signal(SNAME("changed"));
}
Ref<NavigationPolygon> TileData::get_navigation_polygon(int p_layer_id) const {
	ERR_FAIL_INDEX_V(p_layer_id, navigation.size(), Ref<NavigationPolygon>());
	return navigation[p_layer_id];
}
void TileData::set_probability(float p_probability) {