Removed subscribers from the codebase (#11153)

refs #11152

- Added subscribers table drop migration
- Removed subscribers from schema
- Removed subscribers controllers/routes/regression tests
- Removed subscriber related API code
- Removed subscribers from internal apps
- Removed subscriber importer
- Removed subscriber model
- Removed subscriber related permissions
- Removed webhook code related to subscribers
- When upgrading to v3 it is on the site admin to migrate all zapps or any other webhook clients to use members
- Removed subscriber-specific translation
- Removed subscriber lab flag

core/frontend/services/routing/helpers/context.js

@@ -10,12 +10,9 @@
  * 2. req.params.page - always has the page parameter, regardless of if the URL contains a keyword
  * 3. data - used for telling the difference between posts and pages
  */
-const labs = require('../../../../server/services/labs'),
-    // @TODO: fix this!! These regexes are app specific and should be dynamic. They should not belong here....
+const // @TODO: fix this!! These regexes are app specific and should be dynamic. They should not belong here....
     // routeKeywords.private: 'private'
     privatePattern = new RegExp('^\\/private\\/'),
-    // routeKeywords.subscribe: 'subscribe'
-    subscribePattern = new RegExp('^\\/subscribe\\/'),
     // routeKeywords.amp: 'amp'
     ampPattern = new RegExp('\\/amp\\/$'),
     homePattern = new RegExp('^\\/$');
@@ -58,12 +55,6 @@ function setResponseContext(req, res, data) {
         }
     }
 
-    if (subscribePattern.test(res.locals.relativeUrl) && labs.isSet('subscribers') === true) {
-        if (!res.locals.context.includes('subscribe')) {
-            res.locals.context.push('subscribe');
-        }
-    }
-
     if (data && data.post) {
         if (!res.locals.context.includes('post')) {
             res.locals.context.push('post');

core/server/api/canary/index.js

@@ -67,10 +67,6 @@ module.exports = {
         return shared.pipeline(require('./settings'), localUtils);
     },
 
-    get subscribers() {
-        return shared.pipeline(require('./subscribers'), localUtils);
-    },
-
     get members() {
         return shared.pipeline(require('./members'), localUtils);
     },