quick, low-effort binlog upload when created by commands deriving from DotnetCommand (#49513)

Author: baronfel

src/Cli/Microsoft.DotNet.Cli.Utils/ExponentialRetry.cs

@@ -55,7 +55,7 @@ public static async Task<T> ExecuteAsyncWithRetry<T>(Func<Task<T>> action,
                 return result;
             }
         }
-        throw new Exception("Timer should not be exhausted");
+        throw new Exception($"Timer for task {taskDescription} should not be exhausted.");
     }
 
     public static async Task<T> ExecuteWithRetry<T>(Func<T> action,

test/Microsoft.NET.TestFramework/Commands/TestCommand.cs

@@ -166,7 +166,7 @@ public virtual CommandResult Execute(IEnumerable<string> args)
             {
                 command.StandardOutputEncoding(StandardOutputEncoding);
             }
-            
+
             string fileToShow = Path.GetFileNameWithoutExtension(spec.FileName!).Equals("dotnet", StringComparison.OrdinalIgnoreCase) ?
                 "dotnet" :
                 spec.FileName!;
@@ -176,6 +176,15 @@ public virtual CommandResult Execute(IEnumerable<string> args)
             var result = ((Command)command).Execute(ProcessStartedHandler);
             Log.WriteLine($"Command '{display}' exited with exit code {result.ExitCode}.");
 
+            if (Environment.GetEnvironmentVariable("HELIX_WORKITEM_UPLOAD_ROOT") is string uploadRoot)
+            {
+                var binlogFiles = Directory.GetFiles(spec.WorkingDirectory ?? Environment.CurrentDirectory, "*.binlog");
+                foreach (string binlogFile in binlogFiles)
+                {
+                    File.Copy(binlogFile, Path.Combine(uploadRoot, Path.GetFileName(binlogFile)), true);
+                }
+            }
+
             return result;
         }