[fabric] Fix events being dispatched to wrong react component for Paper components

Summary: The tag value is stored in the `reactTag` property on macOS. The adapter used by the RCTLegacyViewManagerInteropComponentView was being provided the `tag` property value which set all interceptors to tag -1 leading to incorrect event dispatching on the JS side.

Test Plan:
- Open the settings pane in Zeratul and select the appearance tab.
- Toggle the theme PopUpButton

With the fix, the theme changes while before the zoom would change.
 https://pxl.cl/3vZRd

Reviewers: shawndempsey, #rn-desktop

Reviewed By: shawndempsey

Differential Revision: https://phabricator.intern.facebook.com/D49897662

Author: Nick Lefever

packages/react-native/React/Fabric/Mounting/ComponentViews/LegacyViewManagerInterop/RCTLegacyViewManagerInteropComponentView.mm

@@ -16,6 +16,10 @@
 #import <react/utils/ManagedObjectWrapper.h>
 #import "RCTLegacyViewManagerInteropCoordinatorAdapter.h"
 
+#if TARGET_OS_OSX // [macOS
+#import <React/RCTView.h>
+#endif // macOS]
+
 using namespace facebook::react;
 
 static NSString *const kRCTLegacyInteropChildComponentKey = @"childComponentView";
@@ -210,8 +214,14 @@ - (void)finalizeUpdates:(RNComponentViewUpdateMask)updateMask
   };
 
   if (!_adapter) {
+#if !TARGET_OS_OSX // [macOS]
     _adapter = [[RCTLegacyViewManagerInteropCoordinatorAdapter alloc] initWithCoordinator:[self _coordinator]
                                                                                  reactTag:self.tag];
+#else // [macOS
+    _adapter = [[RCTLegacyViewManagerInteropCoordinatorAdapter alloc] initWithCoordinator:[self _coordinator]
+                                                                                 reactTag:self.reactTag.integerValue];
+#endif // macOS]
+
     _adapter.eventInterceptor = ^(std::string eventName, folly::dynamic event) {
       if (weakSelf) {
         __typeof(self) strongSelf = weakSelf;