Use proper logging for artifacts rake task

Using logging we get a known structure, and the time of the message.
Last change removed the unused `order` statement. This is not used
because `find_each` uses the primary key anyway.

changelogs/unreleased-ee/zj-improve-object-store-rake-task.yml

+---
+title: Use a logger for the artifacts migration rake task
+merge_request:
+author:
+type: changed

lib/tasks/gitlab/artifacts.rake

+require 'logger'
+
 desc "GitLab | Migrate files for artifacts to comply with new storage format"
 namespace :gitlab do
   namespace :artifacts do
     task migrate: :environment do
-      puts 'Artifacts'.color(:yellow)
+      logger = Logger.new(STDOUT)
+      logger.info('Starting transfer of artifacts')
+
       Ci::Build.joins(:project)
         .with_artifacts
-        .order(id: :asc)
         .where(artifacts_file_store: [nil, ArtifactUploader::LOCAL_STORE])
         .find_each(batch_size: 10) do |build|
         begin
-          print "Migrating job #{build.id} of size #{build.artifacts_size.to_i.bytes} to remote storage... "
           build.artifacts_file.migrate!(ArtifactUploader::REMOTE_STORE)
           build.artifacts_metadata.migrate!(ArtifactUploader::REMOTE_STORE)
-          puts "OK".color(:green)
+
+          logger.info("Transferred artifacts of #{build.id} of #{build.artifacts_size} to object storage")
         rescue => e
-          puts "Failed: #{e.message}".color(:red)
+          logger.error("Failed to transfer artifacts of #{build.id} with error: #{e.message}")
         end
       end
     end