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Convert a few more tests to waitFor test helpers (#26509)

Continuing my journey to migrate all the Scheduler flush* methods to
async versions of the same helpers.
A
Andrew Clark committed
f0aafa1a7e3338871f60ac3ea8c1c92b8671520c
Parent: 90995ef
Committed by GitHub <noreply@github.com> on 3/29/2023, 9:02:15 PM