Show subgroup projects in the DORA projects comparison visualization

What does this MR do and why?

Updates the DORA projects comparison panel to use the new GraphQL resolver implemented in #507722 (closed). This will allow us to fetch DORA data for all projects in subgroups, while bypassing projects with no DORA data. This will reduce the number of requests required to paginate the data and render the panel, which was causing slow load times in large groups.

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Before	After

How to set up and validate locally

• Mock DORA metrics for a project within a subgroup

[
  [1.month.ago, 5, 1, 5, 2],
  [2.month.ago, 10, 3, 3, 3]
].each do |date, deploys, lead_time_for_changes, time_to_restore_service, incidents_count|
  Dora::DailyMetrics.create!(
    deployment_frequency: deploys,
    lead_time_for_changes_in_seconds: lead_time_for_changes * 1.day.to_i,
    time_to_restore_service_in_seconds: time_to_restore_service * 1.day.to_i,
    incidents_count: incidents_count,
    environment: Project.find(PROJECT_ID).default_environment,
    date: date
  )
end

• Navigate to the Value streams dashboard for the parent group (ex. http://gdk.test:3000/groups/flightjs/-/analytics/dashboards/value_streams_dashboard)
• Find the Projects by DORA categories panel and ensure the subgroup project DOES NOT appear in the list of projects
• Enable the dora_projects_comparison_subgroups feature
• Reload the panel and ensure the subgroup project DOES appear in the list of projects

Related to #523240 (closed)