Fix Gitlab::Seeder.quiet changes leaking

What does this MR do?

Fixes overrides done in .quiet so that they don't leak outside the block

Fixes the order-dependent specs:

bin/rspec './spec/db/production/create_base_work_item_types_spec.rb[1:1:1]' './spec/workers/email_receiver_worker_spec.rb[1:1:2:1:1,1:1:2:3:1]'

Related to #340308 (closed)