process graphics element yaml files with scriban (#2410)

* add content rating to media item template

* process graphics element yaml files with scriban

ErsatzTV.Scanner.Tests/Core/Fakes/FakeLocalFileSystem.cs

@@ -58,6 +58,8 @@ public class FakeLocalFileSystem : ILocalFileSystem
 
     public Unit EmptyFolder(string folder) => Unit.Default;
     public Task<string> ReadAllText(string path) => throw new NotImplementedException();
+    public Task<string[]> ReadAllLines(string path) => throw new NotImplementedException();
+
     public Task<byte[]> ReadAllBytes(string path) => TestBytes.AsTask();
 
     private static List<DirectoryInfo> Split(DirectoryInfo path)