[release/8.0-rc1] Add missing type forwards (#90673)
* Add missing type forwards
Fixes https://github.com/dotnet/runtime/issues/90578
IDispatchImplAttribute, IDispatchImplType and SetWin32ContextInIDispatchAttribute were removed with https://github.com/dotnet/runtime/commit/
9f1dd1aa499a882453b34d4e8810626423fbfed8 and https://github.com/dotnet/runtime/commit/
26a91ad6ac02393c6c7463500c030ec07803c5e6
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
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Co-authored-by: Viktor Hofer <viktor.hofer@microsoft.com>