[release/8.0-rc1] Add missing type forwards (#90673)

* Add missing type forwards

Fixes #90578

IDispatchImplAttribute, IDispatchImplType and SetWin32ContextInIDispatchAttribute were removed with 9f1dd1a and 26a91ad

Those dropped types weren't flagged because APICompat only validates reference assemblies. We have three implementation only shim assemblies: mscorlib, System and System.Data. I verified that no other type forwards were lost between .NET 7 and .NET 8.

* Update mscorlib.cs

---------

Co-authored-by: Viktor Hofer <viktor.hofer@microsoft.com>

src/libraries/shims/mscorlib/src/mscorlib.cs

@@ -109,3 +109,9 @@
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Threading.Tasks.Sources.ManualResetValueTaskSourceCore<>))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Threading.Tasks.Sources.ValueTaskSourceOnCompletedFlags))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Threading.Tasks.Sources.ValueTaskSourceStatus))]
+// These types are required for back-compatibility with .NET Framework and previous versions of .NETCoreApp. -->
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Reflection.Emit.PEFileKinds))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.InteropServices.AssemblyRegistrationFlags))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.InteropServices.ExporterEventKind))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.InteropServices.RegistrationClassContext))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.InteropServices.RegistrationConnectionType))]