Drop double notification on caasapplicationprovisioner in TestWorker and TestWorkerStatusOnly #15880
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Fixes race condition on buffered channel send sometimes notifying twice.
Similar to #15879
QA steps
cd worker/caasapplicationprovisioner
go test -c -race
stress ./caasapplicationprovisioner.test
Documentation changes
N/A
Bug reference
https://jenkins.juju.canonical.com/job/github-make-check-juju/7644/consoleText