2898 Clarify e2e readme for running on firebase test lab (cla: yes)

2902 [in_app_purchases] Fixed typo ‘manuelly’ for ‘manually’ (cla: yes)

2903 [google_maps_flutter(_platform_interface)] Make the plugin friendlier to the web implementation. (cla: yes)

2904 [web] Adding capability to e2e to take screenshot for web tests. (cla: yes, waiting for test harness)

2906 [e2e] Add new e2e_driver for handling response data and performance watcher (waiting for test harness)

2908 [google_maps_flutter_platform_interface] Add dispose method. ()

2909 [google_maps_flutter] Call platform.dispose on GoogleMap widget dispose. (cla: yes)