Billboards throw errors when Zone.js patches Promise to ZoneAwarePromise

### What happened?

When using Cesium in an environment where Zone.js is loaded (for example, Angular or any app that uses Zone.js to patch window.Promise with ZoneAwarePromise), creating BillboardGraphics causes runtime errors in the browser console.

### Reproduction steps

1. Load an application using ZoneJS
2. Create a viewer
3. Add an entity with a BillboardGraphics

### Sandcastle example

https://sandcastle.cesium.com/#c=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

### Environment

Browser: Any
CesiumJS Version: 1.139
Operating System: Windows

Start by reproducing the Sandcastle example in an application where Zone.js patches window.Promise, then trace the BillboardGraphics creation path from the viewer and entity setup. The work is done when adding an entity with a BillboardGraphics produces no runtime errors in the browser console under Zone.js.

Written by the indexing model from the issue text.