Disable flaky test AsyncRelayCommand_AddsTransactionsOrSpans on CI (#4281)

Resolves #4229:
- #4229

#skip-changelog

Author: jamescrosswell

test/Sentry.Maui.CommunityToolkit.Mvvm.Tests/MauiCommunityToolkitMvvmEventsBinderTests.cs

@@ -38,11 +38,14 @@ public Fixture()
 
     private readonly Fixture _fixture = new();
 
-    [Theory]
+    [SkippableTheory]
     [InlineData(true)]
     [InlineData(false)]
     public async Task AsyncRelayCommand_AddsTransactionsOrSpans(bool isActiveTransaction)
     {
+        // TODO: See if we can resolve this and reinstate the test
+        Skip.If(TestEnvironment.IsGitHubActions, "Flaky on CI");
+
         // Arrange
         var transaction = Substitute.For<ITransactionTracer>();
         var span = Substitute.For<ISpan>();