[NativeAOT] Fix ILC warning for NSObject.RegisterToggleRef

[simonrozsival]

This PR implements a workaround for the following build warning:

ILC: Method '[Microsoft.iOS]Foundation.NSObject.RegisterToggleRef(NSObject,native int,bool)' will always throw because:
Invalid IL or CLR metadata in 'Void Foundation.NSObject.RegisterToggleRef(Foundation.NSObject, IntPtr, Boolean)'

Ref #18524

[rolfbjarne]

This doesn't really fit with the managed static registrar, but I think it's good for now.

At some point we might want to move random stuff out of the managed static registrar and into a "MakeEverythingWorkWithNativeAOTStep"...

[rolfbjarne]

The RegisterToggleRef method isn't there on macOS, so you'll have to exclude this logic there:

xamarin-macios/src/Foundation/NSObject2.cs

Lines 307 to 310 in db6bc0a

	#if !NET || !__MACOS__
	[MethodImplAttribute (MethodImplOptions.InternalCall)]
	extern static void RegisterToggleRef (NSObject obj, IntPtr handle, bool isCustomType);
	#endif // !NET || !__MACOS__

[github-actions]

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