Display flaky failure logs on try jobs

The step "find ignored flaky test failure logs" was being run on
CI builders but not on try jobs. Run this step on try jobs,
so flakiness on try jobs can be investigated better.

Bug: https://github.com/dart-lang/dart_ci/issues/160
Change-Id: I57b8466c4ba255528cdfed3c196a8aee12e79058
Reviewed-on: https://dart-review.googlesource.com/c/recipes/+/357040
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: William Hesse <whesse@google.com>
4 files changed