Fix db-cleanup

[dhakalaashish]

This branch addresses improvements/fixes in the db-cleanup cron job. The updates include:

1. SiteAlert Deletion Adjustment: Now, old SiteAlerts are purged based on their eventDate rather than the deletedAt attribute.
2. Notification Retention: The process no longer removes Notifications as part of the database cleanup.
3. AlertMethod Deletion: AlertMethods that are soft-deleted for over 7 days are now permanently removed in the cleanup process. In the alertMethod router, for the db-cleanup, some adjustments were made:
   a. Soft-deleted AlertMethods can be reinstated within 7 days post-deletion, provided the creation threshold isn't exceeded.
   b. The count for the creation cap now considers only active AlertMethods, excluding any that are soft-deleted.

[vercel]

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Name	Status	Preview	Updated (UTC)
fire-alert	❌ Failed (Inspect)		Dec 10, 2023 2:00pm