Make bridgeless the default when the New Arch is enabled (#42182)

Summary:

For 0.74, we would like to have Bridgeless as the default when the New Architecture is enabled.

## Changelog:
[iOS][Breaking] - Make bridgeless the default when the New Arch is enabled

Reviewed By: cortinico

Differential Revision: D52598104

packages/react-native/Libraries/AppDelegate/RCTAppDelegate.mm

@@ -251,7 +251,7 @@ - (BOOL)fabricEnabled
 
 - (BOOL)bridgelessEnabled
 {
-  return NO;
+  return [self newArchEnabled];
 }
 
 #pragma mark - RCTComponentViewFactoryComponentProvider