[samples] Duplicate samples prior to NNBD migration We want to migrate the samples to NNBD. In order for the old samples to keep running on the legacy bots, this duplicates all samples, and changes the legacy bots to run the copies. Note this will cause the legacy bots to report that all the samples tests are skipped and that there are now new tests in the samples_2 suite. Existing failures may re-appear. These will be be re-approved or alternatively Skipped. The follow up CL migrates samples/ffi to NNBD. Issue: https://github.com/dart-lang/sdk/issues/43600. TEST=samples TEST=samples_2 Change-Id: Ib40f8fb71f81c091973aa0f860b1a49bac120d6c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/173523 Reviewed-by: Alexander Thomas <athom@google.com>
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