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)

3557 [url_launcher] Re-endorse null-safe web implementation. (cla: yes, nnbd, p: url_launcher)

3570 [url_launcher] Bump platform interface package to stable NNBD (cla: yes, nnbd, p: url_launcher)

3583 [url_launcher] Fix SDK copypasta in platform interface (cla: yes, nnbd, p: url_launcher)