chore: import upstream snapshot with attribution

dotnet/test/VectorData/VectorData.ConformanceTests/Xunit/DisableTestsAttribute.cs

@@ -0,0 +1,20 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+namespace VectorData.ConformanceTests.Xunit;
+
+/// <summary>
+/// Disable the tests in the decorated scope.
+/// </summary>
+[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class | AttributeTargets.Assembly)]
+public sealed class DisableTestsAttribute : Attribute, ITestCondition
+{
+    public ValueTask<bool> IsMetAsync()
+    {
+        return new(false);
+    }
+
+    public string Skip { get; set; } = "Test disabled due to usage of DisableTestsAttribute";
+
+    public string SkipReason
+        => this.Skip;
+}