CSHARP-4068: Enable preventing patch timeout infrastructure for all tests. (#745)

Author: DmitryLukyanov

tests/MongoDB.Driver.Legacy.Tests/Properties/AssemblyInfo.cs

@@ -14,8 +14,11 @@
 */
 
 using System.Runtime.InteropServices;
+using MongoDB.Driver.Core.TestHelpers.XunitExtensions;
 using Xunit;
 
 [assembly: ComVisible(false)]
 
 [assembly: CollectionBehavior(DisableTestParallelization = true)]
+
+[assembly: TestFramework(XunitExtensionsConsts.TimeoutEnforcingXunitFramework, XunitExtensionsConsts.TimeoutEnforcingFrameworkAssembly)]