Null safety migration of packages/flutter_tools/test/web.shard by @liamappelbe in https://github.com/flutter/flutter/pull/110713

Null safety migration of packages/flutter_tools/test/commands.shard/hermetic, part 1/3 by @liamappelbe in https://github.com/flutter/flutter/pull/110707

Update null safety warnings in prep for Dart 3 by @mit-mit in https://github.com/flutter/flutter/pull/110998

Null safety migration of packages/flutter_tools/test/general.shard, part 2/2 by @liamappelbe in https://github.com/flutter/flutter/pull/110712

Reland: Show output from pub get in flutter pub get by @sigurdm in https://github.com/flutter/flutter/pull/110851