4588 [video_player] Eliminate platform channel from mock platform (waiting for tree to go green, p: video_player)

4593 [webview_flutter] Implements the loadFlutterAsset in the app facing package. (waiting for tree to go green, p: webview_flutter)

4596 [shared_preferences] Remove platform registration (waiting for tree to go green, p: shared_preferences, needs tests)

4597 [in_app-purchase] Updated the ReadMe to remove the deprecated InAppPurchaseAndroidPlatformAddition.enablePendingPurchases  method (waiting for tree to go green, p: in_app_purchase, last mile)

4598 Add missing return for nullably typed function (waiting for tree to go green, needs tests)