Enable `check_maven_path_first` by default

changelogs/unreleased/327487-enable-by-default.yml

+---
+title: Improve the Maven API file endpoints response time when a non existing package is requested
+merge_request: 60142
+author:
+type: performance

config/feature_flags/development/check_maven_path_first.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/327487
 milestone: '13.11'
 type: development
 group: group::package
-default_enabled: false
+default_enabled: true

lib/api/maven_packages.rb

@@ -25,7 +25,7 @@ module API
     helpers do
       def path_exists?(path)
         # return true when FF disabled so that processing the request is not stopped
-        return true unless Feature.enabled?(:check_maven_path_first)
+        return true unless Feature.enabled?(:check_maven_path_first, default_enabled: :yaml)
         return false if path.blank?
 
         Packages::Maven::Metadatum.with_path(path)

spec/requests/api/maven_packages_spec.rb

@@ -49,7 +49,7 @@ RSpec.describe API::MavenPackages do
 
   shared_examples 'rejecting the request for non existing maven path' do |expected_status: :not_found|
     before do
-      if Feature.enabled?(:check_maven_path_first)
+      if Feature.enabled?(:check_maven_path_first, default_enabled: :yaml)
         expect(::Packages::Maven::PackageFinder).not_to receive(:new)
       end
     end