make cli team / channel delete operations also delete webhooks and slash commands (#7028)

i18n/en.json

@@ -6251,10 +6251,18 @@
     "id": "store.sql_webhooks.permanent_delete_incoming_by_user.app_error",
     "translation": "We couldn't delete the webhook"
   },
+  {
+    "id": "store.sql_webhooks.permanent_delete_incoming_by_channel.app_error",
+    "translation": "We couldn't delete the webhook"
+  },
   {
     "id": "store.sql_webhooks.permanent_delete_outgoing_by_user.app_error",
     "translation": "We couldn't delete the webhook"
   },
+  {
+    "id": "store.sql_webhooks.permanent_delete_outgoing_by_channel.app_error",
+    "translation": "We couldn't delete the webhook"
+  },
   {
     "id": "store.sql_webhooks.save_incoming.app_error",
     "translation": "We couldn't save the IncomingWebhook"