fix: Adjust nullability of ApiExtensibility

src/Uno.Foundation/Extensibility/ApiExtensibility.cs

-namespace Uno.Foundation.Extensibility;
+#nullable enable
+
+using System.Diagnostics.CodeAnalysis;
+
+namespace Uno.Foundation.Extensibility;
 
 /// <summary>
 /// Registry for API existensibility providers, used to provide optional
@@ -61,7 +65,8 @@ public static class ApiExtensibility
 	/// <param name="owner">An optional owner to be passed to the extension constructor</param>
 	/// <param name="instance">The instance if the creation was successful</param>
 	/// <returns>True if the creation suceeded, otherwise False.</returns>
-	public static bool CreateInstance<T>(object owner, out T instance) where T : class
+	public static bool CreateInstance<T>(object owner, [NotNullWhen(true)] out T? instance)
+		where T : class
 	{
 		lock (_gate)
 		{
@@ -76,4 +81,17 @@ public static class ApiExtensibility
 
 		return false;
 	}
+
+	internal static T CreateInstance<T>(object owner)
+		where T : class
+	{
+		if (CreateInstance<T>(owner, out var instance))
+		{
+			return instance;
+		}
+		else
+		{
+			throw new InvalidOperationException($"Unable to find {typeof(T)} extension");
+		}
+	}
 }

src/Uno.UWP/ApplicationModel/DataTransfer/DataTransferManager.skia.cs

@@ -11,7 +11,7 @@ namespace Windows.ApplicationModel.DataTransfer
 	{
 		private static readonly Lazy<IDataTransferManagerExtension?> _dataTransferManagerExtension = new Lazy<IDataTransferManagerExtension?>(() =>
 		{
-			if (ApiExtensibility.CreateInstance(typeof(DataTransferManager), out IDataTransferManagerExtension dataTransferManagerExtension))
+			if (ApiExtensibility.CreateInstance(typeof(DataTransferManager), out IDataTransferManagerExtension? dataTransferManagerExtension))
 			{
 				return dataTransferManagerExtension;
 			}

src/Uno.UWP/Devices/Haptics/SimpleHapticsController.skia.cs

@@ -12,10 +12,7 @@ namespace Windows.Devices.Haptics
 
 		partial void InitPlatform()
 		{
-			if (!ApiExtensibility.CreateInstance(typeof(SimpleHapticsController), out _simpleHapticsControllerExtension))
-			{
-				throw new InvalidOperationException($"Unable to find ISimpleHapticsControllerExtension extension");
-			}
+			_simpleHapticsControllerExtension = ApiExtensibility.CreateInstance<ISimpleHapticsControllerExtension>(typeof(SimpleHapticsController));
 		}
 
 		public IReadOnlyList<SimpleHapticsControllerFeedback> SupportedFeedback =>

src/Uno.UWP/Media/Playback/MediaPlayer.others.cs

@@ -24,6 +24,8 @@ namespace Windows.Media.Playback
 				{
 					this.Log().Error("Unable to create an instance of IMediaPlayerExtension. MediaPlayer will not work.");
 				}
+
+				return;
 			}
 
 			_extension.Events = new MediaPlayerEvents(this);

src/Uno.UWP/Networking/Connectivity/ConnectionProfile.skia.cs

@@ -8,7 +8,7 @@ namespace Windows.Networking.Connectivity
 {
 	public partial class ConnectionProfile
 	{
-		private IConnectionProfileExtension _connectionProfileExtension;
+		private IConnectionProfileExtension? _connectionProfileExtension;
 
 		internal static ConnectionProfile GetInternetConnectionProfile() =>
 			new ConnectionProfile();

src/Uno.UWP/UI/ViewManagement/ApplicationView.skia.cs

@@ -19,10 +19,7 @@ namespace Windows.UI.ViewManagement
 
 		public ApplicationView()
 		{
-			if (!ApiExtensibility.CreateInstance(this, out _applicationViewExtension))
-			{
-				throw new InvalidOperationException($"Unable to find IApplicationViewExtension extension");
-			}
+			_applicationViewExtension = ApiExtensibility.CreateInstance<IApplicationViewExtension>(this);
 		}
 
 		public string Title