[release/6.0] Allow nfloat to be in the ObjCRuntime namespace, and make it work for Xamarin.MacCatalyst.dll as well.#60861

Anipik merged 1 commit intorelease/6.0dotnet/runtime:release/6.0from

backport/pr-60854-to-release/6.0dotnet/runtime:backport/pr-60854-to-release/6.0Copy head branch name to clipboard