C#: Move ASP Net Core stubs into stubs folder.

Author: michaelnebel

csharp/ql/test/query-tests/Security Features/CWE-079/XSS/options

@@ -1,3 +1,4 @@
 semmle-extractor-options: /nostdlib /noconfig
 semmle-extractor-options: --load-sources-from-project:${testdir}/../../../../resources/stubs/_frameworks/Microsoft.NETCore.App/Microsoft.NETCore.App.csproj
-semmle-extractor-options: --load-sources-from-project:${testdir}/../../../../resources/stubs/Microsoft.Extensions.Primitives/6.0.0/Microsoft.Extensions.Primitives.csproj
+semmle-extractor-options: --load-sources-from-project:${testdir}/../../../../resources/stubs/Microsoft.Extensions.Primitives/6.0.0/Microsoft.Extensions.Primitives.csproj
+semmle-extractor-options: ${testdir}/../../../../resources/stubs/AspNetCore.cs