feat(perf): Cache labels on the conversation model (#8527)

db/migrate/20231211010807_add_cached_labels_list.rb

@@ -0,0 +1,19 @@
+class AddCachedLabelsList < ActiveRecord::Migration[7.0]
+  def change
+    add_column :conversations, :cached_label_list, :string
+    Conversation.reset_column_information
+    ActsAsTaggableOn::Taggable::Cache.included(Conversation)
+
+    update_exisiting_conversations
+  end
+
+  private
+
+  def update_exisiting_conversations
+    ::Account.find_in_batches do |account_batch|
+      account_batch.each do |account|
+        Migration::ConversationCacheLabelJob.perform_later(account)
+      end
+    end
+  end
+end