Instance Statistics MVP: object counts [BE]

Overview

In &4147 (closed), we describe the need for an instance-level overview of instance activity.

frontend issue: #235754 (closed)

Proposal

Introduce the Instance Statistics page in the admin panel.

• Show counts for users, projects, groups, issues, MRs, and pipelines. These counts should include the total number of these objects on the instance.
• Query and store these counts daily for performance. Show when the data was pulled.

Implementation plan

• Create database table and dummy GraphQL endpoint (weight: 2)
• Implement the query logic using BatchCount and `created_at (weight: 3)
• Set up the cron job (weight 1)

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