Move MR Analytics to the group/workspace level
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### Release notes
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### Problem to solve
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MR Analytics should be one of the first features that moves over after the Workspace project is ready. It's currently project based. But if it was group based, we would dogfood it.
Plus we analyze throughput every month, so we would probably always know if there was a bug or data was wrong etc
### Proposal
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Once we complete https://gitlab.com/groups/gitlab-org/-/epics/6768
Move MR Analytics to the namespace construct so that they would be available at project and group level
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### Metrics
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Measure Number of monthly users accessing group level MR analytics
### Tier
~"GitLab Premium"
This is based on the fact that project level MR analytics are premium - https://docs.gitlab.com/ee/user/analytics/merge_request_analytics.html
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