Merge branch '333150-flaky-test-spec-lib-gitlab-background_migration' into 'master'

Use the Gitlab::Database::AsWithMaterialized helper for PG11 support [RUN ALL RSPEC]

See merge request gitlab-org/gitlab!63662

lib/gitlab/background_migration/disable_expiration_policies_linked_to_no_container_images.rb

@@ -18,7 +18,7 @@ module Gitlab
       def perform(from_id, to_id)
         ContainerExpirationPolicy.where(enabled: true, project_id: from_id..to_id).each_batch(of: BATCH_SIZE) do |batch|
           sql = <<-SQL
-            WITH batched_relation AS MATERIALIZED (#{batch.select(:project_id).limit(BATCH_SIZE).to_sql})
+            WITH batched_relation AS #{Gitlab::Database::AsWithMaterialized.materialized_if_supported} (#{batch.select(:project_id).limit(BATCH_SIZE).to_sql})
             UPDATE container_expiration_policies
             SET enabled = FALSE
             FROM batched_relation