dont build solution with no project file

Author: devhl-labs

.github/workflows/samples-dotnet10.yaml

@@ -45,7 +45,7 @@ jobs:
           - samples/client/petstore/csharp/httpclient/net10.0/Petstore
           - samples/client/petstore/csharp/httpclient/net10.0/Petstore-nonPublicApi
           # unity
-          - samples/client/petstore/csharp/unityWebRequest/net10.0/Petstore
+          # - samples/client/petstore/csharp/unityWebRequest/net10.0/Petstore
     steps:
       - uses: actions/checkout@v5
       - uses: actions/setup-dotnet@v5.0.0