Extract common no_quote_columns code

Common code for determining columns that do not need
to be quoted in bulk insers based on each model class.

This change is to be used in specific mentions migration
on each of the models: design, snippet,
commit(would override this method), issue, merge request.

ee/spec/lib/gitlab/background_migration/user_mentions/create_resource_user_mention_spec.rb

@@ -47,6 +47,10 @@ describe Gitlab::BackgroundMigration::UserMentions::CreateResourceUserMention do
                     title_html: "epic title  @#{author.username}", description: description_mentions)
     end
 
+    it 'has correct no_quote_columns' do
+      expect(Gitlab::BackgroundMigration::UserMentions::Models::Epic.no_quote_columns).to match([:note_id, :epic_id])
+    end
+
     it 'migrates mentions' do
       join = MigrateEpicMentionsToDb::JOIN
       conditions = MigrateEpicMentionsToDb::QUERY_CONDITIONS

lib/gitlab/background_migration/user_mentions/create_resource_user_mention.rb

@@ -24,14 +24,11 @@ module Gitlab
               mentions << record.build_mention_values
             end
 
-            no_quote_columns = [:note_id]
-            no_quote_columns << resource_user_mention_model.resource_foreign_key
-
             Gitlab::Database.bulk_insert(
               resource_user_mention_model.table_name,
               mentions,
               return_ids: true,
-              disable_quote: no_quote_columns,
+              disable_quote: resource_model.no_quote_columns,
               on_conflict: :do_nothing
             )
           end

lib/gitlab/background_migration/user_mentions/models/concerns/mentionable_migration_methods.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module BackgroundMigration
+    module UserMentions
+      module Models
+        # Extract common no_quote_columns method used in determining the columns that do not need
+        # to be quoted for corresponding models
+        module MentionableMigrationMethods
+          extend ::ActiveSupport::Concern
+
+          class_methods do
+            def no_quote_columns
+              [
+                :note_id,
+                user_mention_model.resource_foreign_key
+              ]
+            end
+          end
+        end
+      end
+    end
+  end
+end

lib/gitlab/background_migration/user_mentions/models/epic.rb

@@ -8,6 +8,7 @@ module Gitlab
         class Epic < ActiveRecord::Base
           include IsolatedMentionable
           include CacheMarkdownField
+          include MentionableMigrationMethods
 
           attr_mentionable :title, pipeline: :single_line
           attr_mentionable :description