monit: handle arbitrary error status (#10743)
* handle arbitrary error status
* add changelog fragment
* mock module in test
* Update changelogs/fragments/10743-monit-handle-unknown-status.yml
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(cherry picked from commit 469e557b95)
Co-authored-by: Simon Kelly <skelly@dimagi.com>
Co-authored-by: Felix Fontein <felix@fontein.de>