unify app output and main logs for MacCatalyst

Author: matouskozak

src/Microsoft.DotNet.XHarness.Apple/AppOperations/AppRunner.cs

@@ -84,6 +84,10 @@ public async Task<ProcessExecutionResult> RunMacCatalystApp(
     {
         _mainLog.WriteLine($"*** Executing '{appInformation.AppName}' on MacCatalyst ***");
         var appOutputLog = _logs.Create(appInformation.BundleIdentifier + ".log", LogType.ApplicationLog.ToString(), timestamp: true);
+        
+        // The app output log is not directly accessible. 
+        // Hence, we duplicate the log to the main console log to simplify the UX of failure investigation.
+        IFileBackedLog aggregatedLogAppOutput = Log.CreateReadableAggregatedLog(_mainLog, appOutputLog);
 
         var envVariables = new Dictionary<string, string>();
         AddExtraEnvVars(envVariables, extraEnvVariables);
@@ -95,10 +99,11 @@ public async Task<ProcessExecutionResult> RunMacCatalystApp(
         }
 
         using (appOutputLog)
+        using (aggregatedLogAppOutput)
         {
             return await RunAndWatchForAppSignal(() => RunMacCatalystApp(
                 appInformation,
-                appOutputLog,
+                aggregatedLogAppOutput,
                 timeout,
                 waitForExit,
                 extraAppArguments ?? Enumerable.Empty<string>(),