Remove $!exhausted attribute altogether
Remove $!exhausted attribute altogether

- it is not needed, because we only need it in the supervisor loop
- the idea of making it an attribute was to allow Telemetry to access it
  - but that is probably better served by putting that in Thread itself

MasterDuke17/rakudo,salortiz/rakudo,nbrown/rakudo,tony-o/rakudo,softmoth/rakudo,labster/rakudo,nbrown/rakudo,salortiz/rakudo,Gnouc/rakudo,rakudo/rakudo,labster/rakudo,lucasbuchala/rakudo,rakudo/rakudo,lucasbuchala/rakudo,labster/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,softmoth/rakudo,lucasbuchala/rakudo,tbrowder/rakudo,tbrowder/rakudo,rakudo/rakudo,softmoth/rakudo,tony-o/rakudo,Gnouc/rakudo,tbrowder/rakudo,nbrown/rakudo,salortiz/rakudo,tony-o/rakudo,awwaiid/rakudo,salortiz/rakudo,rakudo/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,rakudo/rakudo,softmoth/rakudo,lucasbuchala/rakudo,awwaiid/rakudo,nbrown/rakudo,tony-o/rakudo,awwaiid/rakudo,lucasbuchala/rakudo,salortiz/rakudo,nbrown/rakudo,tony-o/rakudo,tbrowder/rakudo,tony-o/rakudo,Gnouc/rakudo,labster/rakudo,awwaiid/rakudo,softmoth/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,salortiz/rakudo,tbrowder/rakudo,labster/rakudo,rakudo/rakudo,awwaiid/rakudo,Gnouc/rakudo,nbrown/rakudo,labster/rakudo