Take view archived config into account on users and posts api endpoints (#19014)

* Take view archived config into account on users and posts api endpoints

* Move the inChannel check to the top level

i18n/en.json

@@ -4251,6 +4251,14 @@
     "id": "api.user.verify_email.token_parse.error",
     "translation": "Failed to parse token data from email verification"
   },
+  {
+    "id": "api.user.view_archived_channels.get_posts_for_channel.app_error",
+    "translation": "Cannot retrieve posts for an archived channel"
+  },
+  {
+    "id": "api.user.view_archived_channels.get_users_in_channel.app_error",
+    "translation": "Cannot retrieve users for an archived channel"
+  },
   {
     "id": "api.web_socket.connect.upgrade.app_error",
     "translation": "Failed to upgrade websocket connection."