This reverts commit c67eafa8.

* Add native stacktrace field for PlatformException

* Mute the readValue check for stacktrace.

* polish

* Add unit test and further polish

* Added more comments

* remove unnecessary import

* fill in stacktrace to JSONMethodCodec and fix tests

* fix style

* Fix format

* Remove unnecessary TODO since not all explicitly declared errors have stacktrace in it from native side.

* Handle case for exception without stacktrace on jsonMethodCodec

* Add more unit tests

* format test
Co-authored-by: Ben Li <libe@google.com>

Revert: Update prepare_package.dart to use the process_runner package instead having duplicate code. #62710 (#63608)

This reverts #62710, since it has a noSuchMethodError in some circumstances.

This isn't just a straight git revert, because I had to resolve the conflicts in the reverted pubspec.yaml files and re-run flutter update-packages --force-upgrade to make the checksums match.

* Regenerate _no.arb and _nb.arb from scratch

* Revert no <--> nb synonym logic

* Update prod builders.

This is to make the builders show up in the flutter dashboard.

Bug:
  https://github.com/flutter/flutter/issues/63256

* Add mac and windows bots.

* Fix flaky flag.

* Rename taskName as task_name.