Set prefersFuseboxFrontend capability flag in jsinspector-modern targets (facebook#43689)

Summary:

Context: facebook/react-native-devtools-frontend#34.

Changelog: [Internal]

Differential Revision: D55474521

Author: huntie

packages/react-native/React/Base/RCTBridge.mm

@@ -436,7 +436,7 @@ - (void)setUp
                   .integrationName = "iOS Bridge (RCTBridge)",
               });
         },
-        {.nativePageReloads = true});
+        {.nativePageReloads = true, .prefersFuseboxFrontend = true});
   }
 
   Class bridgeClass = self.bridgeClass;

packages/react-native/ReactAndroid/src/main/jni/react/jni/ReactInstanceManagerInspectorTarget.cpp

@@ -50,7 +50,7 @@ ReactInstanceManagerInspectorTarget::ReactInstanceManagerInspectorTarget(
                       "Android Bridge (ReactInstanceManagerInspectorTarget)",
               });
         },
-        {.nativePageReloads = true});
+        {.nativePageReloads = true, .prefersFuseboxFrontend = true});
   }
 }
 

packages/react-native/ReactAndroid/src/main/jni/react/runtime/jni/JReactHostInspectorTarget.cpp

@@ -45,7 +45,7 @@ JReactHostInspectorTarget::JReactHostInspectorTarget(
           // Reject the connection.
           return nullptr;
         },
-        {.nativePageReloads = true});
+        {.nativePageReloads = true, .prefersFuseboxFrontend = true});
   }
 }
 

packages/react-native/ReactCommon/jsinspector-modern/InspectorInterfaces.cpp

@@ -28,7 +28,8 @@ const folly::dynamic targetCapabilitiesToDynamic(
     const InspectorTargetCapabilities& capabilities) {
   return folly::dynamic::object(
       "nativePageReloads", capabilities.nativePageReloads)(
-      "nativeSourceCodeFetching", capabilities.nativeSourceCodeFetching);
+      "nativeSourceCodeFetching", capabilities.nativeSourceCodeFetching)(
+      "prefersFuseboxFrontend", capabilities.prefersFuseboxFrontend);
 }
 
 namespace {

packages/react-native/ReactCommon/jsinspector-modern/InspectorInterfaces.h

@@ -36,6 +36,7 @@ class IDestructible {
 struct InspectorTargetCapabilities {
   const bool nativePageReloads = false;
   const bool nativeSourceCodeFetching = false;
+  const bool prefersFuseboxFrontend = false;
 };
 
 const folly::dynamic targetCapabilitiesToDynamic(

packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTHost.mm

@@ -191,7 +191,7 @@ - (void)start
                   .integrationName = "iOS Bridgeless (RCTHost)",
               });
         },
-        {.nativePageReloads = true});
+        {.nativePageReloads = true, .prefersFuseboxFrontend = true});
   }
   if (_instance) {
     RCTLogWarn(