Refactor test base class and remove cleanup fixture

Removed the TestCleanupFixture and related IClassFixture usage from BaseExtractorTestClass. Cleaned up and reorganized using directives, removing unnecessary usings and adding specific NLog usings. The file now only contains BaseExtractorTestClass with its logger initialization.

Author: gfs

RecursiveExtractor.Tests/ExtractorTests/BaseExtractorTestClass.cs

@@ -1,24 +1,10 @@
-using System;
-using Microsoft.CST.RecursiveExtractor.Tests;
-using NLog;
+using NLog;
 using NLog.Config;
 using NLog.Targets;
-using Xunit;
 
 namespace RecursiveExtractor.Tests.ExtractorTests;
 
-/// <summary>
-/// Shared fixture that cleans up temp directories once after all tests in a class complete.
-/// </summary>
-public class TestCleanupFixture : IDisposable
-{
-    public void Dispose()
-    {
-        TestPathHelpers.DeleteTestDirectory();
-    }
-}
-
-public class BaseExtractorTestClass : IClassFixture<TestCleanupFixture>
+public class BaseExtractorTestClass
 {
     protected static readonly NLog.Logger Logger = NLog.LogManager.GetCurrentClassLogger();