70714 [flutter_tools] use frontend_server for web test compilation (a: null-safety, cla: yes, team, tool)

70718 [flutter_tools] display message for current null safety mode (a: null-safety, cla: yes, tool)

70719 Add extra Flutter settings to ios_app_with_extensions Podfile (cla: yes, platform-ios, t: xcode, team, tool)

70722 Simplify the flutter_web_plugins plugin registration API. (#70337) (cla: yes, tool)

70735 Force regeneration of old Podfile (cla: yes, platform-ios, t: xcode, tool, waiting for tree to go green)

70739 Revert “Allow any iOS app to be added to an existing host app” (cla: yes, team, tool)