New dotnet test experience should create the directory of the trace file if not present

[Youssef1313]

Setting DOTNET_CLI_TEST_TRACEFILE to artifacts\TestResults\dotnet-test-trace-logs.txt will fail if artifacts\TestResults directory doesn't exist. I think it's a good idea if dotnet test creates the directory instead of failing.

2025-03-10T14:22:48.8265690Z [dotnet test - 03/10/2025 14:22:48.820]System.IO.DirectoryNotFoundException: Could not find a part of the path 'D:\a\_work\1\s\artifacts\TestResults\dotnet-test-trace-logs.txt'.
2025-03-10T14:22:48.8266204Z    at Microsoft.Win32.SafeHandles.SafeFileHandle.CreateFile(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options)
2025-03-10T14:22:48.8266505Z    at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode)
2025-03-10T14:22:48.8267030Z    at System.IO.Strategies.OSFileStreamStrategy..ctor(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode)
2025-03-10T14:22:48.8267600Z    at System.IO.Strategies.FileStreamHelpers.ChooseStrategyCore(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode)
2025-03-10T14:22:48.8268021Z    at System.IO.StreamWriter.ValidateArgsAndOpenPath(String path, Boolean append, Int32 bufferSize)
2025-03-10T14:22:48.8268276Z    at System.IO.File.AppendText(String path)
2025-03-10T14:22:48.8268511Z    at Microsoft.DotNet.Tools.Test.Logger.LogTrace(Func`1 messageLog)