MM-23596: Ability to list private channels for team (#14925)

Summary:
store, app, api and go driver support for listing private channels

Ticket Link:
https://mattermost.atlassian.net/browse/MM-23596

i18n/en.json

@@ -6322,6 +6322,10 @@
     "id": "store.sql_channel.get_pinnedpost_count.app_error",
     "translation": "Unable to get the channel pinned post count."
   },
+  {
+    "id": "store.sql_channel.get_private_channels.get.app_error",
+    "translation": "Unable to get private channels."
+  },
   {
     "id": "store.sql_channel.get_public_channels.get.app_error",
     "translation": "Unable to get public channels."