✨ Allowed setting expiry for complimentary subscriptions

closes https://github.com/TryGhost/Team/issues/1727

- allows site owners to give cardless free trials to members by setting expiry on complimentary subscriptions
- also allows complimentary members to upgrade as paid member

ghost/admin/app/templates/settings/labs.hbs

@@ -226,19 +226,6 @@
                         </div>
                     </div>
                 </div>
-                <div class="gh-expandable-block">
-                    <div class="gh-expandable-header">
-                        <div>
-                            <h4 class="gh-expandable-title">Cardless trials</h4>
-                            <p class="gh-expandable-description">
-                               Add support for expiring complimentary subscriptions
-                            </p>
-                        </div>
-                        <div class="for-switch">
-                           <GhFeatureFlag @flag="compExpiring" />
-                        </div>
-                    </div>
-                </div>
                 <div class="gh-expandable-block">
                     <div class="gh-expandable-header">
                         <div>

ghost/core/core/shared/labs.js

@@ -16,7 +16,8 @@ const messages = {
 // flags in this list always return `true`, allows quick global enable prior to full flag removal
 const GA_FEATURES = [
     'newsletterPaywall',
-    'freeTrial'
+    'freeTrial',
+    'compExpiring'
 ];
 
 // NOTE: this allowlist is meant to be used to filter out any unexpected
@@ -30,8 +31,7 @@ const ALPHA_FEATURES = [
     'urlCache',
     'beforeAfterCard',
     'memberAttribution',
-    'searchHelper',
-    'compExpiring'
+    'searchHelper'
 ];
 
 module.exports.GA_KEYS = [...GA_FEATURES];