4449 [local_auth] Fix activity leak in LocalAuthPlugin (cla: yes, waiting for tree to go green, p: local_auth, platform-android, last mile)

4450 [webview_flutter] Add platform interface method loadRequest. (cla: yes, waiting for tree to go green, p: webview_flutter)

4458 [in_app_purchase] Add support for promotional offers through Store-Kit wrappers (cla: yes, waiting for tree to go green, p: in_app_purchase, platform-ios)

4459 [webview_flutter_android] Fix bugs in Java Implementation of the Pigeon API (cla: yes, p: webview_flutter, platform-android)

4460 [webview_flutter] Fix Flaky Resize Test (cla: yes, p: webview_flutter, platform-android)