Enable CI/CD builds queue limit by default

app/services/ci/register_job_service.rb

@@ -171,7 +171,7 @@ module Ci
 
     def max_queue_depth
       @max_queue_depth ||= begin
-        if Feature.enabled?(:gitlab_ci_builds_queue_limit, runner, default_enabled: false)
+        if Feature.enabled?(:gitlab_ci_builds_queue_limit, runner, default_enabled: true)
           MAX_QUEUE_DEPTH
         else
           ::Gitlab::Database::MAX_INT_VALUE

config/feature_flags/development/gitlab_ci_builds_queue_limit.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/323201
 milestone: '13.10'
 type: development
 group: group::continuous integration
-default_enabled: false
+default_enabled: true