Enable COM interop for collectible classes (#20919)

Enable COM interop for collectible classes (#20919)

* Enable COM interop for collectible classes

* Modify DispatchInfo to use LoaderAllocator handles

The DispatchMemberInfo was using global handles to refer to the managed
MemberInfo instances. That doesn't work with unloadability.
This change modifies it to use handles allocated from LoaderAllocator.

* Disable COM interop for WinRT types

* Remove collectible check from IsTypeVisibleFromCom. That fixes three
  new COM interop tests
* Add collectible check to GetComClassFactory when we check for
  unsupported interop with WinRT

* Add COM unloadability tests

Add two tests to test COM unloadability:
* One for using native COM server from managed COM client
* One for using managed COM objects from native client

* Add unloading test for IUnknownTest

* Disable NETClientPrimitivesInALC on Win ARM

The NETClientPrimitives is disabled there too.