Disable test solution creation for .NET 11

Author: lbussell

tests/Microsoft.DotNet.Docker.Tests/TestSolution.cs

@@ -45,6 +45,13 @@ public TestSolution(ProductImageData imageData, string sampleName, DockerHelper
 
     private string CreateTestSolutionWithSdkImage(string solutionDir, string appType)
     {
+        if (_imageData.Version.Major == 11)
+        {
+            // Project templates are not yet updated for .NET 11.
+            // Re-enable when https://github.com/dotnet/sdk/issues/50295 is resolved.
+            return "";
+        }
+
         Directory.CreateDirectory(solutionDir);
         string appProjectContainerName = _imageData.GetIdentifier($"create-{appType}");
         string testProjectContainerName = _imageData.GetIdentifier("create-test");