Prepare async index to for Ci::JobArtifact

This commit adds a new index to optimize how we fetch
job artifacts when recalculating artifact size and ordering
them by id.

Changelog: performance

db/post_migrate/20220518091952_prepare_job_artifact_ordering_index.rb

+# frozen_string_literal: true
+
+class PrepareJobArtifactOrderingIndex < Gitlab::Database::Migration[2.0]
+  INDEX_NAME = 'index_ci_job_artifacts_on_id_and_created_at_and_project_id'
+
+  def up
+    prepare_async_index :ci_job_artifacts, [:id, :created_at, :project_id], name: INDEX_NAME
+  end
+
+  def down
+    unprepare_async_index :notes, [:id, :created_at, :project_id], name: INDEX_NAME
+  end
+end

db/schema_migrations/20220518091952

+d8862fbc28d41c2d61dbb49415ab344e5c010940cede13fe2c6bfdc7832fb605
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