Werk #14881: Add missing service state conditions for alert handler

It's now possible to use "WARN" - "WARN", "CRIT" - "CRIT" and "UNKNOWN" - "UNKNOWN" in the alert handler rule option "Match service event type".

Alert handler rely on the last soft state, so this states are needed, e.g. if you would like to create a rule that should match a WARN state on the second check attempt.

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