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>
