Fabric: Fix over reporting trait changes (#49431)

Summary:
Fixes #49330. We can keep the same logic as paper arch , please see #39439.

## Changelog:

[IOS] [FIXED] - Fabric: Fix over reporting trait changes

Pull Request resolved: #49431

Test Plan: Repro in #49330.

Reviewed By: rshest

Differential Revision: D69740128

Pulled By: javache

fbshipit-source-id: 2946df68ab7eb88809c21dfcf33ce23f4cd6cb41

Author: zhongwuzw

packages/react-native/React/Base/Surface/SurfaceHostingView/RCTSurfaceHostingView.mm

@@ -200,6 +200,11 @@ - (void)setActivityIndicatorViewFactory:(RCTSurfaceHostingViewActivityIndicatorV
 - (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection
 {
   [super traitCollectionDidChange:previousTraitCollection];
+
+  if (RCTSharedApplication().applicationState == UIApplicationStateBackground) {
+    return;
+  }
+
   [[NSNotificationCenter defaultCenter]
       postNotificationName:RCTUserInterfaceStyleDidChangeNotification
                     object:self