Enable `packages_finder_helper_deploy_token` by default

Changelog: performance

app/finders/concerns/packages/finder_helper.rb

@@ -25,7 +25,7 @@ module Packages
     end
 
     def projects_visible_to_reporters(user, within_group:)
-      if user.is_a?(DeployToken) && Feature.enabled?(:packages_finder_helper_deploy_token)
+      if user.is_a?(DeployToken) && Feature.enabled?(:packages_finder_helper_deploy_token, default_enabled: :yaml)
         user.accessible_projects
       else
         within_group.all_projects

changelogs/unreleased/327916-enable-packages_finder_helper_deploy_token-by-default.yml

+---
+title: Improve the packages finder helper SQL queries when handling deploy tokens
+merge_request: 59739
+author:
+type: performance

config/feature_flags/development/packages_finder_helper_deploy_token.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/326808
 milestone: '13.11'
 type: development
 group: group::package
-default_enabled: false
+default_enabled: true