Feature/send validation emails

Send out notification emails for all tasks that have failed in the last hour. Add running this task at an hourly schedule

gso/schedules/send_email_notifications.py

@@ -7,7 +7,7 @@ from gso.worker import celery
 
 
 @celery.task
-@scheduler(CronScheduleConfig(name="Send email notifications", minute="30"))
+@scheduler(CronScheduleConfig(name="Send email notifications", hour="2", minute="30"))
 def vacuum_tasks() -> None:
-    """Run this task every hour on the half hour."""
+    """Run this task every night at 2:30 AM."""
     start_process("task_send_email_notifications")