[flutter_tools] Remove shuffle from doctor test by @christopherfujino in https://github.com/flutter/flutter/pull/107744

[flutter_tools] migrate clean_test to null-safety by @christopherfujino in https://github.com/flutter/flutter/pull/107750

Revert “Read dart_plugin_registrant path from FlutterProject to support non-standard path.” by @christopherfujino in https://github.com/flutter/flutter/pull/107850

[flutter_tools] Fix null check errors in attach command by @christopherfujino in https://github.com/flutter/flutter/pull/107864

[flutter_tool] Allow includes relative to shader path by @zanderso in https://github.com/flutter/flutter/pull/107862