Added internalLinking labs flag (#20006)

ref https://linear.app/tryghost/issue/MOM-1

apps/admin-x-settings/src/components/settings/advanced/labs/AlphaFeatures.tsx

@@ -63,6 +63,10 @@ const features = [{
     title: 'Prevent Member Spam Signups',
     description: 'Enables features to help combat spam member signups',
     flag: 'membersSpamPrevention'
+},{
+    title: 'Internal Linking',
+    description: 'Adds internal URL search to editor link inputs',
+    flag: 'internalLinking'
 }];
 
 const AlphaFeatures: React.FC = () => {

ghost/admin/app/services/feature.js

@@ -82,6 +82,7 @@ export default class FeatureService extends Service {
     @feature('portalImprovements') portalImprovements;
     @feature('onboardingChecklist') onboardingChecklist;
     @feature('membersSpamPrevention') membersSpamPrevention;
+    @feature('internalLinking') internalLinking;
 
     _user = null;
 

ghost/core/core/shared/labs.js

@@ -51,7 +51,8 @@ const ALPHA_FEATURES = [
     'lexicalIndicators',
     // 'adminXOffers',
     'adminXDemo',
-    'membersSpamPrevention'
+    'membersSpamPrevention',
+    'internalLinking'
 ];
 
 module.exports.GA_KEYS = [...GA_FEATURES];