Enable group_analytics_dashboards feature flag

What does this MR do and why?

Enables the group_analytics_dashboards feature flag. This enables the display of the group level dashboard listing when navigating to Analyze > Analytics Dashbaords. Previously the link would redirect directly to the Value streams dashboard.

MR acceptance checklist

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Screenshots or screen recordings

Before	After
before-group-analytics-dashboards	after-group-analytics-dashboards

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Related to #416970 (closed)