Native: throw explicit error if old-native lacks updateTextureData

Addresses review: existence-check before calling this._engine.updateTextureData so older native binaries (PROTOCOL_VERSION not bumped) restore the explicit 'updateTextureData not implemented.' error instead of a raw 'is not a function'.

Author: bkaradzic-microsoft

packages/dev/core/src/Engines/thinNativeEngine.pure.ts

@@ -2698,6 +2698,10 @@ export class ThinNativeEngine extends ThinEngine {
             return;
         }
 
+        if (!this._engine.updateTextureData) {
+            throw new Error("updateTextureData not implemented.");
+        }
+
         // bgfx updates the requested sub-rectangle of the existing texture (faceIndex selects the cube
         // face / array layer, lod selects the mip level). invertY is forwarded so the native side can match
         // the vertical orientation the base texture upload uses. Mip regeneration after a partial update is