Stream various updates from different components to `stderr` instead
of `stdout` on `dart run`.
TEST=pkg/dartdev/test/
Fixes: https://github.com/dart-lang/sdk/issues/62818
Change-Id: Icd5caa65aab092341d370b09c016f89ae2a57987
Cq-Include-Trybots: luci.dart.try:pkg-linux-debug-try,pkg-linux-release-arm64-try,pkg-linux-release-try,pkg-mac-release-arm64-try,pkg-mac-release-try,pkg-win-release-arm64-try,pkg-win-release-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/486203
Reviewed-by: Ben Konyi <bkonyi@google.com>
Commit-Queue: Daco Harkes <dacoharkes@google.com>
Daco Harkes
2d94b0cbb8