Fix issue with DST starting/ending causing overlaps/gaps

By looping through each event and using normalize, the tzinfo might change DST status. We can check for this change in DST status to adjust the end date either forward or backward, depending if DST stopped or started.

engine/apps/schedules/ical_events/adapter/amixr_recurring_ical_events_adapter.py

@@ -38,6 +38,15 @@ def get_events_from_ical_between(
             end_date + datetime.timedelta(days=EXTRA_LOOKUP_DAYS),
         )
 
+        for event in events:
+            if hasattr(event[ICAL_DATETIME_END].dt,'tzinfo'):
+                dt = event[ICAL_DATETIME_END].dt
+                tz = dt.tzinfo
+                normalized = tz.normalize(dt)
+                if normalized.tzinfo != tz:
+                    diff = dt.dst() - normalized.dst()
+                    event[ICAL_DATETIME_END].dt = normalized + diff
+
         def filter_extra_days(event):
             event_start, event_end = self.get_start_and_end_with_respect_to_event_type(event)
             if event_start > event_end: