Hashed Storage is enabled by default on new installations

What does this MR do?

Enable Hashed Storage by default on new installations

This is part of the work for https://gitlab.com/gitlab-org/gitlab-ee/issues/8690

EE Backport in : https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/14129

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content