Enable store_instance_statistics_measurements FF

This change enables `store_instance_statistics_measurements` feature
flag by default.

app/workers/analytics/instance_statistics/count_job_trigger_worker.rb

@@ -14,7 +14,7 @@ module Analytics
       idempotent!
 
       def perform
-        return if Feature.disabled?(:store_instance_statistics_measurements)
+        return if Feature.disabled?(:store_instance_statistics_measurements, default_enabled: true)
 
         recorded_at = Time.zone.now
         measurement_identifiers = Analytics::InstanceStatistics::Measurement.identifiers

changelogs/unreleased/enable-store-instance-statistics-ff-by-default.yml

+---
+title: Store object counts periodically for instance statistics
+merge_request: 42433
+author:
+type: changed

config/feature_flags/development/store_instance_statistics_measurements.yml

@@ -4,4 +4,4 @@ introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/41300
 rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/247871
 group: group::analytics
 type: development
-default_enabled: false
+default_enabled: true