3499 [android_alarm_manager] Migrated android_alarm_manager to support null safety #75233 (cla: yes, nnbd, p: android_alarm_manager)

3500 [google_maps_flutter_platform_interface ]fix version (cla: yes, p: google_maps_flutter, waiting for tree to go green)

3501 Merge upcoming camera updates (cla: yes, p: camera)

3502 Run pub global activate before pub global run (cla: yes)

3503 [camera] Removed obsolete example folder from camera root (cla: yes, p: camera, platform-android)

3505 [shared_preferences] Update macOS for NNBD (cla: yes, nnbd, p: shared_preferences, platform-macos)

3506 Run activate before run (cla: yes)