fix: make sure RNTester builds with USE_HERMES=0 (#51772)

Summary:
This PR makes sure React Native still builds with USE_HERMES=0.

## Changelog:

[IOS] [FIXED] - make RNTester build with USE_HERMES=0

Pull Request resolved: https://github.com/facebook/react-native/pull/51772

Test Plan: CI Green

Reviewed By: andrewdacenko

Differential Revision: D75876484

Pulled By: cipolleschi

fbshipit-source-id: 72f3a7d33c19063b52c4c3e577ad2c5eae049d90

packages/react-native/Libraries/AppDelegate/React-RCTAppDelegate.podspec

@@ -66,7 +66,9 @@ Pod::Spec.new do |s|
   s.dependency "React-CoreModules"
   s.dependency "React-RCTFBReactNativeSpec"
   s.dependency "React-defaultsnativemodule"
-  s.dependency 'React-hermes'
+  if use_hermes
+    s.dependency 'React-hermes'
+  end
 
   add_dependency(s, "React-runtimeexecutor", :additional_framework_paths => ["platform/ios"])
   add_dependency(s, "ReactCommon", :subspec => "turbomodule/core", :additional_framework_paths => ["react/nativemodule/core"])

packages/react-native/React-Core.podspec

@@ -122,7 +122,10 @@ Pod::Spec.new do |s|
   s.dependency "React-featureflags"
   s.dependency "React-runtimescheduler"
   s.dependency "Yoga"
-  s.dependency 'React-hermes'
+
+  if use_hermes
+    s.dependency "React-hermes"
+  end
 
   s.resource_bundles = {'React-Core_privacy' => 'React/Resources/PrivacyInfo.xcprivacy'}