Remove forward npm package request feature flag

Remove `forward_npm_package_registry_requests` feature flag

ee/app/views/admin/application_settings/_package_registry.haml

-- if Feature.enabled?(:forward_npm_package_registry_requests, default_enabled: true) && Gitlab.config.packages.enabled
+- if Gitlab.config.packages.enabled
   %section.settings.as-package.no-animate#js-package-settings{ class: ('expanded' if expanded_by_default?) }
     .settings-header
       %h4

ee/lib/api/helpers/packages/dependency_proxy_helpers.rb

@@ -9,7 +9,7 @@ module API
         }.freeze
 
         def redirect_registry_request(forward_to_registry, package_type, options)
-          if redirect_registry_request_available? && forward_to_registry
+          if forward_to_registry && redirect_registry_request_available?
             redirect(registry_url(package_type, options))
           else
             yield
@@ -28,8 +28,7 @@ module API
         end
 
         def redirect_registry_request_available?
-          Feature.enabled?(:forward_npm_package_registry_requests, default_enabled: true) &&
-            ::Gitlab::CurrentSettings.current_application_settings.npm_package_requests_forwarding
+          ::Gitlab::CurrentSettings.current_application_settings.npm_package_requests_forwarding
         end
       end
     end

ee/spec/lib/api/helpers/packages/dependency_proxy_helpers_spec.rb

@@ -35,20 +35,15 @@ describe API::Helpers::Packages::DependencyProxyHelpers do
     context 'with npm packages' do
       let(:package_type) { :npm }
 
-      where(:feature_flag, :application_setting, :forward_to_registry, :example_name) do
-        true  | true  | true  | 'executing redirect'
-        true  | true  | false | 'executing fallback'
-        true  | false | true  | 'executing fallback'
-        true  | false | false | 'executing fallback'
-        false | true  | true  | 'executing fallback'
-        false | true  | false | 'executing fallback'
-        false | false | true  | 'executing fallback'
-        false | false | false | 'executing fallback'
+      where(:application_setting, :forward_to_registry, :example_name) do
+        true  | true  | 'executing redirect'
+        true  | false | 'executing fallback'
+        false | true  | 'executing fallback'
+        false | false | 'executing fallback'
       end
 
       with_them do
         before do
-          stub_feature_flags(forward_npm_package_registry_requests: { enabled: feature_flag })
           stub_application_setting(npm_package_requests_forwarding: application_setting)
         end
 
@@ -60,7 +55,6 @@ describe API::Helpers::Packages::DependencyProxyHelpers do
       let(:forward_to_registry) { true }
 
       before do
-        stub_feature_flags(forward_npm_package_registry_requests: { enabled: true })
         stub_application_setting(npm_package_requests_forwarding: true)
       end
 

ee/spec/requests/api/npm_packages_spec.rb

@@ -63,42 +63,26 @@ describe API::NpmPackages do
     context 'a public project' do
       it_behaves_like 'returning the npm package info'
 
-      context 'with forward_npm_package_registry_requests enabled' do
+      context 'with application setting enabled' do
         before do
-          stub_feature_flags(forward_npm_package_registry_requests: { enabled: true })
+          stub_application_setting(npm_package_requests_forwarding: true)
         end
 
-        context 'with application setting enabled' do
-          before do
-            stub_application_setting(npm_package_requests_forwarding: true)
-          end
-
-          it_behaves_like 'returning the npm package info'
+        it_behaves_like 'returning the npm package info'
 
-          context 'with unknown package' do
-            it 'returns a redirect' do
-              get api("/packages/npm/unknown")
+        context 'with unknown package' do
+          it 'returns a redirect' do
+            get api("/packages/npm/unknown")
 
-              expect(response).to have_gitlab_http_status(:found)
-              expect(response.headers['Location']).to eq('https://registry.npmjs.org/unknown')
-            end
+            expect(response).to have_gitlab_http_status(:found)
+            expect(response.headers['Location']).to eq('https://registry.npmjs.org/unknown')
           end
         end
-
-        context 'with application setting disabled' do
-          before do
-            stub_application_setting(npm_package_requests_forwarding: false)
-          end
-
-          it_behaves_like 'returning the npm package info'
-
-          it_behaves_like 'returning forbidden for unknown package'
-        end
       end
 
-      context 'with forward_npm_package_registry_requests disabled' do
+      context 'with application setting disabled' do
         before do
-          stub_feature_flags(forward_npm_package_registry_requests: { enabled: false })
+          stub_application_setting(npm_package_requests_forwarding: false)
         end
 
         it_behaves_like 'returning the npm package info'

ee/spec/support/shared_examples/requests/api/packages_tags_shared_examples.rb

@@ -14,7 +14,7 @@ RSpec.shared_examples 'returns package tags' do |user_type|
   using RSpec::Parameterized::TableSyntax
 
   before do
-    stub_feature_flags(forward_npm_package_registry_requests: { enabled: false })
+    stub_application_setting(npm_package_requests_forwarding: false)
     project.send("add_#{user_type}", user) unless user_type == :no_type
   end