[cfe] Groups standard tests in update_expectations.dart
[cfe] Groups standard tests in update_expectations.dart

Change-Id: I4cc8d2ea7699bebf53bda63bca47031521f6e57f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/141540
Reviewed-by: Johnni Winther <0f64ef784d57ffb064b634040f9eeba0d33d0be4@google.com>
Commit-Queue: Johnni Winther <0f64ef784d57ffb064b634040f9eeba0d33d0be4@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk