Make Instance Statistics available without having to enable Usage Ping

Problem to solve

Customers need to gather usage statistics (either via Cohorts or DevOps Score, previously ConvDev Index) for reporting purposes but both require that Usage Ping be activated. Customers have various reasons for not wanting to activate Usage Ping, including but not limited to keeping the domain name/IP address of their GitLab instance private.

Intended users

GitLab instance Admin / VP Application Development and higher

Proposal

Decouple Instance Statistics from Usage Ping.

Permissions and Security

Admin level

What does success look like, and how can we measure that?

Provide the ability for admins/managers to report on the usage growth of their GitLab instance without having to activate Usage Ping.

Links / references

Zendesk ticket: https://gitlab.zendesk.com/agent/tickets/127312 (internal-only link)

A similar issue discussed this to some extent: https://gitlab.com/gitlab-org/gitlab-ce/issues/50575