refactor: simplify bot takeover callback order

app/models/concerns/assignment_handler.rb

@@ -3,7 +3,7 @@ module AssignmentHandler
   include Events::Types
 
   included do
-    before_validation :ensure_assignee_is_from_team
+    before_save :ensure_assignee_is_from_team
     after_commit :notify_assignment_change, :process_assignment_changes
   end
 

app/models/conversation.rb

@@ -66,7 +66,6 @@ class Conversation < ApplicationRecord
   validates :inbox_id, presence: true
   validates :contact_id, presence: true
   before_validation :validate_additional_attributes
-  before_validation :handle_agent_bot_takeover_by_assignee
   validates :additional_attributes, jsonb_attributes_length: true
   validates :custom_attributes, jsonb_attributes_length: true
   validates :uuid, uniqueness: true
@@ -117,6 +116,7 @@ class Conversation < ApplicationRecord
   has_many :attachments, through: :messages
   has_many :reporting_events, dependent: :destroy_async
 
+  before_save :handle_agent_bot_takeover_by_assignee
   before_save :ensure_snooze_until_reset
   before_create :determine_conversation_status
   before_create :ensure_waiting_since