Enable DORA deployment frequency in VSA

This change enables the dora_deployment_frequency_in_vsa feature flag by
default.

ee/changelogs/unreleased/enable_dora_deployment_frequency_in_vsa_ff.yml

+---
+title: Use DORA deployment frequency metric in Value Stream Analytics
+merge_request: 60927
+author:
+type: changed

ee/config/feature_flags/development/dora_deployment_frequency_in_vsa.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/329178
 milestone: '13.12'
 type: development
 group: group::optimize
-default_enabled: false
+default_enabled: true

ee/lib/gitlab/analytics/cycle_analytics/summary/group/deploy.rb

@@ -19,7 +19,7 @@ module Gitlab
             private
 
             def deployments_count
-              @deployments_count ||= if Feature.enabled?(:dora_deployment_frequency_in_vsa)
+              @deployments_count ||= if Feature.enabled?(:dora_deployment_frequency_in_vsa, default_enabled: :yaml)
                                        deployment_count_via_dora_api
                                      else
                                        deployment_count_via_finder