don't run NativeAOT tests on AppVeyor, as one of them takes 3 minutes and we hit the 1h limit (#2023)

Author: adamsitnik

tests/BenchmarkDotNet.IntegrationTests/MemoryDiagnoserTests.cs

@@ -67,6 +67,9 @@ public void MemoryDiagnoserIsAccurate(IToolchain toolchain)
         [FactDotNetCoreOnly("We don't want to test NativeAOT twice (for .NET Framework 4.6.1 and .NET 6.0)")]
         public void MemoryDiagnoserSupportsNativeAOT()
         {
+            if (ContinuousIntegration.IsAppVeyorOnWindows()) // too time consuming for AppVeyor (1h limit)
+                return;
+
             MemoryDiagnoserIsAccurate(
                 NativeAotToolchain.CreateBuilder()
                     .UseNuGet(