[typemap] Handle duplicates of generic types properly

Fixes: dotnet#4809
Context: 7117414
Context: a017561

Part of the a017561 commit dealt with mappings from certain Java types
which point to the same Managed type by making sure that they all refer
to the same type definition and managed type name.  However, in doing so
it failed to synchronize the property which indicates that we are
dealing with an interface or generic type, in which case such a type
should be ignored by the type mapping code in the runtime.

In this particular case, the issue was with the `ArrayAdapter` type
which has both a generic and non-generic definitions and it so happens
that the *first* type in `Mono.Android` assembly is the generic one,
thus it, and its duplicate, should be ignored but due to the failure to
synchronize the `SkipInJavaToManaged` property, the second instance of
the type was not skipped on the runtime, resulting in the following
exception:

    System.MemberAccessException: Cannot create an instance of Android.Widget.ArrayAdapter`1[T] because Type.ContainsGenericParameters is true.
      at System.Reflection.RuntimeConstructorInfo.DoInvoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00054] in <d772a4bbe86c4dc5b425d8ca91786b91>:0
      at System.Reflection.RuntimeConstructorInfo.Invoke (System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <d772a4bbe86c4dc5b425d8ca91786b91>:0
      at System.Reflection.ConstructorInfo.Invoke (System.Object[] parameters) [0x00000] in <d772a4bbe86c4dc5b425d8ca91786b91>:0
      at Java.Interop.TypeManager.CreateProxy (System.Type type, System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x0001b] in <43cddc76fe22432dbdbcea2397b6fcd7>:0
      at Java.Interop.TypeManager.CreateInstance (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer, System.Type targetType) [0x00111] in <43cddc76fe22432dbdbcea2397b6fcd7>:0
      at Java.Lang.Object.GetObject (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer, System.Type type) [0x00023] in <43cddc76fe22432dbdbcea2397b6fcd7>:0
      at Java.Lang.Object._GetObject[T] (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00017] in <43cddc76fe22432dbdbcea2397b6fcd7>:0
      at Java.Lang.Object.GetObject[T] (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00000] in <43cddc76fe22432dbdbcea2397b6fcd7>:0
      at Android.Widget.ArrayAdapter.CreateFromResource (Android.Content.Context context, System.Int32 textArrayResId, System.Int32 textViewResId) [0x0006d] in <43cddc76fe22432dbdbcea2397b6fcd7>:0
      at AndroidApp1.MainActivity.OnCreate (Android.OS.Bundle savedInstanceState) [0x00031] in <51ce4ed05744482eb8a8079a399a17d2>:0
      at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_savedInstanceState) [0x0000f] in <43cddc76fe22432dbdbcea2397b6fcd7>:0
      at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.3(intptr,intptr,intptr)

This commit adds synchronization of the `SkipInJavaToManaged` property
which results in the sample attached to the GitHub issue to work
properly.

Note: for some weird reason the error occurred *only* with the *Release*
build of `Mono.Android.dll` and *only* in the framework v9.0 (that is
API28) - if the app targetted any other API it would not fail.  I can't
see why this would be so since the relevant code was very similar
between v9.0 and other frameworks and it was *identical* in case of
the *Debug* build of the v9.0 framework.

src/Xamarin.Android.Build.Tasks/Utilities/TypeMapGenerator.cs

@@ -271,6 +271,7 @@ void SyncDebugDuplicates (Dictionary<string, List<TypeMapDebugEntry>> javaDuplic
 				for (int i = 1; i < duplicates.Count; i++) {
 					duplicates[i].TypeDefinition = template.TypeDefinition;
 					duplicates[i].ManagedName = template.ManagedName;
+					duplicates[i].SkipInJavaToManaged = template.SkipInJavaToManaged;
 				}
 			}
 		}