"Host Tests for ios_debug_sim" failing on bots but passing locally #63843
Description
Example PR's failed run: https://ci.chromium.org/p/flutter/builders/try/Mac%20iOS%20Engine/7106?
These unit tests were fixed in flutter/engine@0cda293 and the tree eventually turned green after that PR landed. But that bot started turning red again for the some reason, see https://ci.chromium.org/p/flutter/builders/prod/Mac%20iOS%20Engine/6386.
It's almost like the tests are running with an old version of ios_test_flutter but run_tests.py is ensuring that that is getting built before the tests are run.
#63802 is probably related.