Ensure that staging and gitlab.com are configured as close as possible in terms of feature flags

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Prior improvements

gitlab-com/chatops!241 (merged)

Potential proposal

• Periodic report listing all feature flags that diverge between staging, and production
• A table of comparison showing feature flags, their state in staging and gitlab.com and when it was enabled, associated with rollout issue

Suggestion from gitlab-com/gl-infra/production#5931 (closed)