Add simple maintainer-only roulette via Danger
What does this MR do and why?
Adds a simple roulette system same as for analytics stack before: https://gitlab.com/gitlab-org/analytics-section/product-analytics/analytics-stack/-/merge_requests/183
How to set up and validate locally
Maintainer is posted based on reviewer roulette.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.