3755 [path_provider] Switch to new analysis options (cla: yes, p: path_provider, platform-linux, platform-macos, platform-windows)

3756 Drop redundant question marks used with dynamic. (cla: yes, p: google_sign_in, p: in_app_purchase, platform-web)

3757 Drop redundant ? for dynamic (cla: yes, p: google_sign_in, platform-web)

3760 Add tests for publish check tool command (cla: yes)

3762 Capitalise Platform class in README (cla: yes, p: android_intent)

3765 [webview_flutter] Fix scroll bar position for Android non-hybrid WebViews (cla: yes, p: webview_flutter)