Add temp debug NSLog statements

Author: stuartmorgan-g

packages/video_player/video_player_avfoundation/ios/Classes/FLTVideoPlayerPlugin.m

@@ -255,6 +255,15 @@ - (void)observeValueForKeyPath:(NSString *)path
     switch (item.status) {
       case AVPlayerItemStatusFailed:
         if (_eventSink != nil) {
+          // DO NOT LAND. For debugging CI failures.
+          NSLog(@"AVPlayer error '%@' (%@ %ld) [%@]", item.error.localizedDescription,
+                item.error.domain, item.error.code, item.error.userInfo);
+          if (@available(iOS 14.5, *)) {
+            for (NSError *underlyingError in item.error.underlyingErrors) {
+              NSLog(@"- underlying error '%@' (%@ %ld) [%@]", item.error.localizedDescription,
+                    item.error.domain, item.error.code, item.error.userInfo);
+            }
+          }
           _eventSink([FlutterError
               errorWithCode:@"VideoError"
                     message:[@"Failed to load video: "