Delete customizable_dashboards and group_analytics_dashboard_editor feature flags

Daniele Rossettirequested to merge
drosse/remove-customizable-dashboards-feature-flags into master

What does this MR do and why?

Delete customizable_dashboards and group_analytics_dashboard_editor feature flags. Feature code has been removed as part of !199437 (merged) and !199435 (merged)

Closing the feature flags rollout issues once this is merged.

References

Part of Remove the deprecated analytics dashboard custo... (#556902 - closed)

Screenshots or screen recordings

NA

How to set up and validate locally

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Edited by Daniele Rossetti

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