[infra] Ensure all message are written before exiting test.py Closing the DebugLogger ensures that any buffered messages are flushed before mulittest.dart calls exit(). Change-Id: If55629bae2fcc518c566c60ba4bd9aa9fddae65e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98678 Auto-Submit: Alexander Thomas <athom@google.com> Reviewed-by: William Hesse <whesse@google.com> Commit-Queue: Alexander Thomas <athom@google.com>
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