The first in a series of changes that deletes all DDC tests running
with unsound null safety. Follow up changes will remove more tests
configurations, and null safety mode plumbing for the DDC infra.
* Delete the unsound version of some suites.
* Renames the sound suites to be more descriptive of the code in the
test instead of the mode it is run in.
Change-Id: If2edfecc811bb78a77a1e93bd6d0b75f22c3e80c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/365520
Reviewed-by: Mark Zhou <markzipan@google.com>
Reviewed-by: Nate Bosch <nbosch@google.com>
Nicholas Shahan
bc084d0a53