Add feature tests for Groups analytics dashboards

Split out of #390542 (closed).

Copy feature spec from ee/spec/features/projects/analytics/dashboards_spec.rb and put it at ee/spec/features/groups/analytics/dashboards_spec.rb and update to check the group-level dashboard

YAML config flow will be handled in VSD Add feature tests for YAML configuration flow (#410669 - closed)

Opportunity to DRY this and move shared logic to shared examples

TODO

• Add group VSD tests
• Add project VSD tests

Feature flags to test

• group_analytics_dashboard_dynamic_vsd
• project_analytics_dashboard_dynamic_vsd
• clickhouse_data_collection