Fixup Mvc.Razorpages manual issues

Author: wtgodbe

eng/GenAPI.exclusions.txt

@@ -48,3 +48,5 @@ M:Microsoft.AspNetCore.Components.EventCallback`1.#ctor(Microsoft.AspNetCore.Com
 P:Microsoft.AspNetCore.Components.EventCallback`1.HasDelegate
 M:Microsoft.AspNetCore.Components.EventCallback`1.get_HasDelegate
 M:Microsoft.AspNetCore.Components.EventCallback`1.InvokeAsync(`0)
+# Manually implemented - Need to include internal setter
+P:Microsoft.AspNetCore.Mvc.RazorPages.RazorPagesOptions.Conventions

src/Mvc/Mvc.Core/ref/Microsoft.AspNetCore.Mvc.Core.Manual.cs

@@ -1426,6 +1426,16 @@ internal static partial class ViewEnginePath
         public static string ResolvePath(string path) { throw null; }
     }
 }
+namespace Microsoft.AspNetCore.Routing
+{
+    internal sealed partial class DataSourceDependentCache<T> : System.IDisposable where T : class
+    {
+        public DataSourceDependentCache(Microsoft.AspNetCore.Routing.EndpointDataSource dataSource, System.Func<System.Collections.Generic.IReadOnlyList<Microsoft.AspNetCore.Http.Endpoint>, T> initialize) { }
+        public T Value { get { throw null; } }
+        public void Dispose() { }
+        public T EnsureInitialized() { throw null; }
+    }
+}
 namespace Microsoft.Extensions.DependencyInjection
 {
     internal partial class ApiBehaviorOptionsSetup : Microsoft.Extensions.Options.IConfigureOptions<Microsoft.AspNetCore.Mvc.ApiBehaviorOptions>