fix: Add missing graph properties for single-value custom widgets (#327)

CustomWidgets with a Single Value type didn't have all properties correctly set, such as the `title`.

The createGraphWidget() method is safe to be called like this because although its `props: GraphWidgetProps` parameter is *not* directly compatible with type type `SingleValueWidgetProps`, the parameters are being filled in CustomMonitoring.createCustomMetricGroupWidgets(), which only contains fields from their common supertype (`MetricWidgetProps`), therefore making the fields compatible.

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Author: edisongustavo

lib/common/widget/types.ts

@@ -48,6 +48,7 @@ export function createGraphWidget(
 
     case GraphWidgetType.SINGLE_VALUE:
       return new SingleValueWidget({
+        ...props,
         metrics: [...(props.left ?? []), ...(props.right ?? [])],
       });