Inform Weblate reviewers about suggestions that don't pass our checks (check_PO, sanity-check-website)

Originally created by @hefee on #17274 (Redmine)

At the moment only tails-translators get informed when the sanity check of the the staging website breaks.
But these failures needs normally interaction by the langue teams, that’s why tails-l10n should also be informed about those failures. Additionally tails-l10n leans about those checks.

Blocked by tails/sysadmin#17793