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test: fix flaky gh_6819_iproto_watch_not_implemented_test

Netbox internally watches 'box.shutdown' for the sake of graceful
shutdown. The event subscription is async with connection API.
Additionally we check error count on server using different connection.
As a result we may or may not account error for the netbox internal
watch failure.

Let's account the internal watch failure reliably. Also while we at it
let's get rid of races for error count check.

Close #9423

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