Improves the invite mechanism for remote clusters (#31025)

Co-authored-by: Miguel de la Cruz <miguel@ctrlz.es>

server/platform/services/remotecluster/recv.go

@@ -69,6 +69,11 @@ func (rcs *Service) ReceiveInviteConfirmation(confirm model.RemoteClusterInvite)
 	rc.SiteURL = confirm.SiteURL
 	rc.RemoteToken = confirm.Token
 
+	// If the accepting cluster sent a RefreshedToken (its RemoteToken), set it as our Token
+	if confirm.Version >= 2 && confirm.RefreshedToken != "" {
+		rc.Token = confirm.RefreshedToken
+	}
+
 	rcUpdated, err := store.Update(rc)
 	if err != nil {
 		return nil, fmt.Errorf("cannot apply invite confirmation for remote %s: %w", confirm.RemoteId, err)