This reverts commit e52c30cbd5.
It's highly possible that this test was flaky on CI due to mixing units
of seconds and milliseconds in the transient activation calculation.
Revert the workaround for that commit in an attempt to avoid needless
ad-hoc behavior.
We have a 5 second timeout between a user-activated event occurring and
an activation-gated API being invoked in order for that API to succeed.
This is quite fine in normal circumstances, but the machines used in CI
often exceed that limit (we see upwards of 10 seconds passing between
generating the user-activated event and the API call running).
So instead of generating a user-activated event, add a hook to allow
tests to bypass the very next activation check.