fix: set event in foreach AlertDto path so incident resolution check runs

In BaseProvider._enrich(), when iterating over AlertDto objects in a
foreach loop, the event variable was never assigned. This caused
check_incident_resolution() to be silently skipped because the condition
if event and should_check_incidents_resolution evaluates to False.

The enrichment itself succeeds (alerts show as 'resolved' in the UI) but
the incident resolution check never runs, so incidents set to 'resolve on
all_resolved' stay active forever when alerts are resolved via workflow.

Fix: assign event = foreach_context in the AlertDto isinstance branch.

Fixes keephq#6194

Author: DragonBot00

keep/providers/base/base_provider.py

@@ -222,6 +222,7 @@ def _enrich(self, enrichments, results, audit_enabled=True):
 
             if isinstance(foreach_context, AlertDto):
                 fingerprint = foreach_context.fingerprint
+                event = foreach_context
             # if we are in a dict context, use the fingerprint from the dict
             elif isinstance(foreach_context, dict) and "fingerprint" in foreach_context:
                 fingerprint = foreach_context.get("fingerprint")