Fixes from PR comments.

Author: michaelgsharp

test/Microsoft.ML.TestFramework/Attributes/NotArm32FactAttribute.cs

@@ -2,7 +2,9 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System;
 using System.Runtime.InteropServices;
+using Microsoft.ML.TestFrameworkCommon.Attributes;
 
 namespace Microsoft.ML.TestFramework.Attributes
 {

test/Microsoft.ML.TestFramework/Attributes/NotArmFactAttribute.cs

@@ -7,11 +7,11 @@
 using System.Drawing;
 using System.IO;
 using System.Linq;
+using System.Runtime.InteropServices;
 using Microsoft.ML.Data;
 using Microsoft.ML.Model;
 using Microsoft.ML.RunTests;
 using Microsoft.ML.Runtime;
-using Microsoft.ML.TestFramework.Attributes;
 using Microsoft.ML.Transforms.Image;
 using Xunit;
 using Xunit.Abstractions;
@@ -20,6 +20,9 @@ namespace Microsoft.ML.Tests
 {
     public class ImageTests : TestDataPipeBase
     {
+        private static readonly Lazy<bool> _isNotArm = new(() => RuntimeInformation.ProcessArchitecture != Architecture.Arm && RuntimeInformation.ProcessArchitecture != Architecture.Arm64);
+        protected static bool IsNotArm => _isNotArm.Value;
+
         public ImageTests(ITestOutputHelper output) : base(output)
         {
         }
@@ -473,7 +476,7 @@ public void TestBackAndForthConversionWithDifferentOrder()
             Done();
         }
 
-        [NotArmFact("System.Drawing has some issues on ARM. Disabling this test for CI stability. Tracked in https://github.com/dotnet/machinelearning/issues/6043")]
+        [ConditionalFact(nameof(IsNotArm))] //"System.Drawing has some issues on ARM. Disabling this test for CI stability. Tracked in https://github.com/dotnet/machinelearning/issues/6043"
         public void TestBackAndForthConversionWithAlphaNoInterleave()
         {
             IHostEnvironment env = new MLContext(1);
@@ -587,7 +590,7 @@ public void TestBackAndForthConversionWithoutAlphaNoInterleave()
             Done();
         }
 
-        [Fact]
+        [ConditionalFact(nameof(IsNotArm))] //"System.Drawing has some issues on ARM. Disabling this test for CI stability. Tracked in https://github.com/dotnet/machinelearning/issues/6043"
         public void TestBackAndForthConversionWithAlphaInterleaveNoOffset()
         {
             IHostEnvironment env = new MLContext(1);