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Use package:lints/recommended.yaml for pkg/testing. Change-Id: I15aedcc4c82447a9d033b575adae745eb138f6f5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/363484 Commit-Queue: Devon Carew <devoncarew@google.com> Reviewed-by: Nate Bosch <nbosch@google.com>