[vm] Add test for `dart:developer` `registerExtension()` method There was a bugfix in [0] to ensure the passed closure is invoked in the right zone, but it was missing a test. There seems to be also no other tests of `registerExtension()`. => So we'll add a test in this CL. [0] https://dart-review.googlesource.com/c/sdk/+/275842 Issue https://github.com/dart-lang/sdk/issues/53178 Issue https://github.com/flutter/flutter/issues/93676 TEST=dart/flutter_regress_93676_test Change-Id: Ibfdf15026b36beff1db9cef30c69a052b9efc77d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/319940 Commit-Queue: Martin Kustermann <kustermann@google.com> Reviewed-by: Tess Strickland <sstrickl@google.com>
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