Flakey test test_apps/first_example_py (flakey assertion)

[doctorlai-msrc]

This test is flakey
https://github.com/microsoft/jrt-controller/actions/runs/16405622793/job/46351087525

because, the assertion is looking for "Aggregate counter so far is: 15" twice however, the second time may sometimes produce "Aggregate counter so far is: 20" instead.