Comply with grace condition when repeat alert notifications is enabled #3676
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On 2.2.2 we added the possibility to repeat alert notifications, allowing users to keep the old behaviour in their alerts while still having some features of the new stateful alerts.
Unfortunately this option was not taking into account the grace period, so users got notified way too many times, as explained in #3579.
This PR checks the alert history to see when was the last time notifications were send for the alert, and verify that the defined grace period has elapsed before notifying again.
I'm also adding some tests to ensure that all cases (or all I though of) are covered and we don't break any other case by mistake.
Fixes #3579.