Avoid creating import notices for vaccination records

We only need to create important notices for vaccination records if the
`notify_parents` value is false-y. This avoids queueing unnecessary
jobs during imports or when running the database seeds.

Jira-Issue: MAV-2309

Author: thomasleese

app/models/vaccination_record.rb

@@ -309,7 +309,11 @@ def recalculate_next_dose_delay_triage_date
   end
 
   def should_generate_important_notice?
-    notify_parents_previously_changed?
+    if id_previously_changed? # new_record? is not available in after_save
+      !notify_parents # important notices are only generated if this is false
+    else
+      notify_parents_previously_changed?
+    end
   end
 
   def generate_important_notice_if_needed