Week 1 - test limited repos on GitLab.com with hashed storage

Week 1 issue for #4772 (closed) -

Following: https://gitlab.com/gitlab-com/infrastructure/issues/4174 and as a step to gitlab-org&75 (closed) I discussed some additional steps with @stanhu to have an initial rollout in gitlab dot com:

• First week: Let's enable it for new projects for a short period of time (~2 hours) and monitor

Coordinate with @stanhu and geo team for which repos and time window