fix: migration script to run on all reporting events (#6590)

* fix: migration script to run on all reporting events

* fix: don't update user_id if it is already present

* refactor: create a new migration

* feat: update schema

* feat: ignore events with bot handoff

* feat: prefetch conversations with handoff events

* Revert "feat: update schema"

This reverts commit 25ed2856e62655f5f1db14fd0cffad3a69d0b1fb.

* feat: update schema

* refactor: separate method get_conversations_with_bot_handoffs

* refactor: cognitive complexity

* refactor: early return if last_bot_reply is blank

* feat: add async_database_migration queue

* feat: update queue priority

config/sidekiq.yml

@@ -12,19 +12,20 @@
 # even put in dynamic logic, like a host-specific queue.
 # http://www.mikeperham.com/2013/11/13/advanced-sidekiq-host-specific-queues/
 :queues:
-  - [low, 1]
-  - [scheduled_jobs, 1]
-  - [webhooks, 1]
-  - [bots, 1]
-  - [active_storage_analysis, 1]
-  - [action_mailbox_incineration, 1]
-  - [active_storage_purge, 1]
-  - [integrations, 2]
-  - [default, 2]
-  - [mailers, 2]
-  - [medium, 3]
-  - [events, 3]
-  - [action_mailbox_routing, 3]
+  - [async_database_migration, 1]
+  - [low, 2]
+  - [scheduled_jobs, 2]
+  - [webhooks, 2]
+  - [bots, 2]
+  - [active_storage_analysis, 2]
+  - [action_mailbox_incineration, 2]
+  - [active_storage_purge, 2]
+  - [integrations, 3]
+  - [default, 3]
+  - [mailers, 3]
+  - [medium, 4]
+  - [events, 4]
+  - [action_mailbox_routing, 4]
   - [high, 5]
   - [critical, 10]