Remove ff secondary_usage_data_collection

- Remove feature flag for secondary_usage_data_collection
- Add changelog for collecting git fetch information

Relates to https://gitlab.com/gitlab-org/gitlab/issues/322628

ee/app/workers/geo/secondary_usage_data_cron_worker.rb

@@ -13,7 +13,6 @@ module Geo
 
     def perform
       return unless Gitlab::Geo.secondary?
-      return unless Feature.enabled?(:geo_secondary_usage_data_collection)
 
       try_obtain_lease do
         SecondaryUsageData.update_metrics!

ee/changelogs/unreleased/322628-rollout_secondary_usage_data_collection.yml

+---
+title: Add git fetch counts for geo secondaries to usage ping
+merge_request: 56678
+author:
+type: added

ee/config/feature_flags/development/geo_secondary_usage_data_collection.yml

----
-name: geo_secondary_usage_data_collection
-introduced_by_url:
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/322628
-milestone: '13.10'
-type: development
-group: group::geo
-default_enabled: false

ee/spec/workers/geo/secondary_usage_data_cron_worker_spec.rb

@@ -32,7 +32,7 @@ RSpec.describe Geo::SecondaryUsageDataCronWorker, :clean_gitlab_redis_shared_sta
     subject.perform
   end
 
-  it "does not update metrics if it doesn't obtain the lease" do
+  it 'does not update metrics if it does not obtain the lease' do
     expect(subject).to receive(:try_obtain_lease).and_return(false)
     expect(Geo::SecondaryUsageData).not_to receive(:update_metrics!)