Remove `ci_update_queues_for_online_runners` ff

This feature flag
is no longer needed.

app/services/ci/update_build_queue_service.rb

@@ -9,9 +9,7 @@ module Ci
     private
 
     def tick_for(build, runners)
-      if Feature.enabled?(:ci_update_queues_for_online_runners, build.project, default_enabled: true)
-        runners = runners.with_recent_runner_queue
-      end
+      runners = runners.with_recent_runner_queue
 
       runners.each do |runner|
         runner.pick_build!(build)

config/feature_flags/development/ci_update_queues_for_online_runners.yml

----
-name: ci_update_queues_for_online_runners
-introduced_by_url: 
-rollout_issue_url: 
-group: 
-type: development
-default_enabled: true

spec/services/ci/update_build_queue_service_spec.rb

@@ -45,21 +45,7 @@ RSpec.describe Ci::UpdateBuildQueueService do
         runner.update!(contacted_at: Ci::Runner.recent_queue_deadline)
       end
 
-      context 'when ci_update_queues_for_online_runners is enabled' do
-        before do
-          stub_feature_flags(ci_update_queues_for_online_runners: true)
-        end
-
-        it_behaves_like 'does not refresh runner'
-      end
-
-      context 'when ci_update_queues_for_online_runners is disabled' do
-        before do
-          stub_feature_flags(ci_update_queues_for_online_runners: false)
-        end
-
-        it_behaves_like 'refreshes runner'
-      end
+      it_behaves_like 'does not refresh runner'
     end
   end