Disable flaky test (#6685)

* disable flaky test

* adding one more flaky test

Author: michaelgsharp

test/Microsoft.ML.Fairlearn.Tests/GridSearchTest.cs

@@ -6,6 +6,7 @@
 using Microsoft.Data.Analysis;
 using Microsoft.ML.AutoML;
 using Microsoft.ML.Fairlearn.AutoML;
+using Microsoft.ML.TestFramework.Attributes;
 using Xunit;
 using Xunit.Abstractions;
 
@@ -75,7 +76,7 @@ private DataFrame CreateGridScearhDataset()
         /// <summary>
         /// This trial runner run the tests from Grid searh for Binary Classification.ipynb
         /// </summary>
-        [Fact]
+        [X86X64Fact("Currently flaky on non x86/x64 devices. Disabling until we figure it out. See https://github.com/dotnet/machinelearning/issues/6684")]
         public void TestGridSearchTrialRunner2()
         {
             var context = new MLContext();

test/Microsoft.ML.Predictor.Tests/TestPredictors.cs

@@ -147,7 +147,7 @@ public void EarlyStoppingTest()
         /// <summary>
         /// Multiclass Logistic Regression test.
         /// </summary>
-        [Fact]
+        [X86X64Fact("Currently flaky on non x86/x64 devices. Disabling until we figure it out. See https://github.com/dotnet/machinelearning/issues/6684")]
         [TestCategory("Multiclass")]
         [TestCategory("Logistic Regression")]
         public void MulticlassLRTest()