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Commit Message:
De-flake Timer tests by moving timer registrations inside the event loop in order to take advantage of cached monotonic time during timer registration.
When the event loop is not running, real monotonic time keeps moving forward which can result in timers ending up with registration times that are the opposite of what's intended by the test and thus result in spurious test failures.
Additional Description:
Risk Level: n/a
Testing: No flakes after 30k runs
Docs Changes: n/a
Release Notes: n/a
Fixes #12532