Added content visibility feature flag (#20371)

ref MOM-221

- added new feature flag for content visibility.

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

@@ -75,6 +75,10 @@ const features = [{
     title: 'Excerpt in newsletter',
     description: 'Showing excerpt in newsletter',
     flag: 'newsletterExcerpt'
+}, {
+    title: 'Content Visibility',
+    description: 'Enables content visibility in Emails',
+    flag: 'contentVisibility'
 }];
 
 const AlphaFeatures: React.FC = () => {

ghost/core/core/shared/labs.js

@@ -55,7 +55,8 @@ const ALPHA_FEATURES = [
     'lexicalIndicators',
     'adminXDemo',
     'internalLinkingAtLinks',
-    'internalLinkingSearchImprovements'
+    'internalLinkingSearchImprovements',
+    'contentVisibility'
 ];
 
 module.exports.GA_KEYS = [...GA_FEATURES];