fix: declare supportedInterfaceOrientations only on iOS (#46512)

Summary:
This PR adds an ifdef to declare `supportedInterfaceOrientations` only on iOS as this property does not affect other platforms causing a build issue.

## Changelog:

[IOS] [ADDED] - declare supportedInterfaceOrientations only on iOS

Pull Request resolved: #46512

Test Plan: CI Green

Reviewed By: christophpurrer

Differential Revision: D62754746

Pulled By: javache

fbshipit-source-id: e2ca5d96cba87e611c48a87f10bf7831e9051646

packages/react-native/React/Fabric/Mounting/ComponentViews/Modal/RCTFabricModalHostViewController.mm

@@ -58,7 +58,7 @@ - (BOOL)prefersStatusBarHidden
   return [RCTUIStatusBarManager() isStatusBarHidden];
 }
 
-#if RCT_DEV
+#if RCT_DEV && TARGET_OS_IOS
 - (UIInterfaceOrientationMask)supportedInterfaceOrientations
 {
   UIInterfaceOrientationMask appSupportedOrientationsMask =

packages/react-native/React/Views/RCTModalHostViewController.m

@@ -50,7 +50,7 @@ - (BOOL)prefersStatusBarHidden
   return _preferredStatusBarHidden;
 }
 
-#if RCT_DEV
+#if RCT_DEV && TARGET_OS_IOS
 - (UIInterfaceOrientationMask)supportedInterfaceOrientations
 {
   UIInterfaceOrientationMask appSupportedOrientationsMask =