Add logs to debug VM Service Publication (#43616)

Adding logs to help debug why VM Service is being published when it shouldn't (flutter/flutter#129987 and flutter/flutter#129836).

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

Author: vashworth

shell/platform/darwin/ios/framework/Source/FlutterDartVMServicePublisher.mm

@@ -80,6 +80,8 @@ - (void)stopService {
 }
 
 - (void)publishServiceProtocolPort:(NSURL*)url {
+  // TODO(vashworth): Remove once done debugging https://github.com/flutter/flutter/issues/129836
+  FML_LOG(INFO) << "Publish Service Protocol Port";
   DNSServiceFlags flags = kDNSServiceFlagsDefault;
 #if TARGET_IPHONE_SIMULATOR
   // Simulator needs to use local loopback explicitly to work.

shell/platform/darwin/ios/framework/Source/FlutterEngine.mm

@@ -871,6 +871,8 @@ - (BOOL)createShell:(NSString*)entrypoint
     FML_LOG(ERROR) << "Could not start a shell FlutterEngine with entrypoint: "
                    << entrypoint.UTF8String;
   } else {
+    // TODO(vashworth): Remove once done debugging https://github.com/flutter/flutter/issues/129836
+    FML_LOG(INFO) << "Enabled VM Service Publication: " << settings.enable_vm_service_publication;
     [self setupShell:std::move(shell)
         withVMServicePublication:settings.enable_vm_service_publication];
     if ([FlutterEngine isProfilerEnabled]) {