[chore][pkg/stanza] Ensure all start/stop calls are in balanced #28294
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Follows #28228
This normalizes calls to
Start
andStop
across the test suite.In some cases,
poll
is called directly in order to trigger behavior independently of timing. However, we should either usepoll
directly, or use bothStart
andStop
exactly once. In the future, I expectpoll
will be exported and tested directly as part of an internal package.