Make test.dart support Emacs buffers better (#9353)
Make test.dart support Emacs buffers better (#9353)

In particular, if stdout.supportsAnsiEscapes is false, don't output ANSI.

Also, output stdout/stderr of tests that are normally silenced, if they fail.

Also, update the output to be more convenient when debugging.

Also, expand some abbreviations.
turnidge/flutter,flutter/flutter,cbracken/flutter,cbracken/flutter,flutter/flutter,flutter/flutter,tvolkert/flutter,flutter/flutter,flutter/flutter,turnidge/flutter,Hixie/flutter,Hixie/flutter,Hixie/flutter,turnidge/flutter,cbracken/flutter,flutter/flutter,Hixie/flutter,Hixie/flutter,cbracken/flutter,tvolkert/flutter,Hixie/flutter,Hixie/flutter,flutter/flutter,Hixie/flutter,flutter/flutter,tvolkert/flutter,tvolkert/flutter,cbracken/flutter,turnidge/flutter,cbracken/flutter,cbracken/flutter,cbracken/flutter,tvolkert/flutter,Hixie/flutter,flutter/flutter,turnidge/flutter,cbracken/flutter,tvolkert/flutter,tvolkert/flutter,tvolkert/flutter,Hixie/flutter,tvolkert/flutter,flutter/flutter,tvolkert/flutter,cbracken/flutter