Backport of cleanup: prevent leaks from time.After into release/1.2.x #12653
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Backport
This PR is auto-generated from #11983 to be assessed for backporting due to the inclusion of the label backport/1.2.x.
The below text is copied from the body of the original PR.
This PR replaces use of time.After with a safe helper function
that creates a time.Timer to use instead. The new function returns
both a time.Timer and a Stop function that the caller must handle.
Unlike time.NewTimer, the helper function does not panic if the duration
set is <= 0.
Fixes #11982