3545 Honor, and scrub, the 1.0 compatibility promise (cla: yes, p: android_intent, p: connectivity, p: device_info, p: package_info, p: path_provider, p: sensors, p: share, p: shared_preferences, p: url_launcher, p: video_player, platform-linux, platform-macos, platform-web, platform-windows)

3601 [android_intent] Bump version for NNBD stable (cla: yes, nnbd, p: android_intent)

3607 [android_intent] Fix Flutter SDK version (cla: yes, nnbd, p: android_intent)

3659 [android_intent] move unit test to nullsafety (cla: yes, p: android_intent, waiting for tree to go green)