Make Instance Statistics available without having to enable Usage Ping
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### 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
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