fix(iOS): subscribe to orientation changes only on iOS (#46531)

Summary:
This PR adds iOS ifdefs to `RCTUIManager` to subscribe to orientation changes on this platform.

The `UIDeviceOrientationDidChangeNotification` symbol is only available there.

## Changelog:

[IOS] [FIXED] - subscribe to orientation changes in RCTUIManager only on iOS

Pull Request resolved: #46531

Test Plan: CI Green

Reviewed By: philIip

Differential Revision: D62864013

Pulled By: cipolleschi

fbshipit-source-id: 341df9ac765735273378d017b63fcb7a4d8e98e5

packages/react-native/React/Modules/RCTUIManager.m

@@ -196,10 +196,12 @@ - (void)setBridge:(RCTBridge *)bridge
  name:@"RCTAccessibilityManagerDidUpdateMultiplierNotification"
  object:a11yManager];
  });
+#if TARGET_OS_IOS
  [[NSNotificationCenter defaultCenter] addObserver:self
  selector:@selector(namedOrientationDidChange)
  name:UIDeviceOrientationDidChangeNotification
  object:nil];
+#endif
  [RCTLayoutAnimation initializeStatics];
 }
 
@@ -265,6 +267,7 @@ - (void)didReceiveNewContentSizeMultiplier
  };
 }
 
+#if TARGET_OS_IOS
 - (void)namedOrientationDidChange
 {
  NSDictionary *orientationEvent = deviceOrientationEventBody([UIDevice currentDevice].orientation);
@@ -278,6 +281,7 @@ - (void)namedOrientationDidChange
  body:orientationEvent];
 #pragma clang diagnostic pop
 }
+#endif
 
 - (dispatch_queue_t)methodQueue
 {