Ping new shared channels remotes immediately (#25850)

* option for auto inviting plugin to all shared channels.

* auto-invite remotes to shared channels when flag set

* fix unit test

* immediately ping new remotes; fix unique siteurl bug

* make i18n-extract

* fix translations

* fix merge conflicts

* make modules-tidy

* revert accidental go.mod change

* revert accidental go.sum changes

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/i18n/en.json

@@ -1185,6 +1185,10 @@
     "id": "api.command_remote.cluster_removed",
     "translation": "Secure connection {{.RemoteId}} {{.Result}}."
   },
+  {
+    "id": "api.command_remote.confirm_invitation.error",
+    "translation": "Could not confirm invitation: {{.Error}}"
+  },
   {
     "id": "api.command_remote.decode_invitation.error",
     "translation": "Could not decode invitation: {{.Error}}"