fix: Substream only cameras should not be triggerable (#1848)

- Closes #1846

src/camera-manager/camera.ts

@@ -34,10 +34,12 @@ export class Camera {
   }
 
   async initialize(options: CameraInitializationOptions): Promise<Camera> {
-    options.stateWatcher.subscribe(
-      this._stateChangeHandler,
-      this._config.triggers.entities,
-    );
+    if (this._capabilities?.has('trigger')) {
+      options.stateWatcher.subscribe(
+        this._stateChangeHandler,
+        this._config.triggers.entities,
+      );
+    }
     this._onDestroy(() => options.stateWatcher.unsubscribe(this._stateChangeHandler));
     return this;
   }