[client] Stop netbird login from retrying a refusal for 30 seconds

`netbird up` and `netbird login` both run Login through the backoff cycle, and
each carried its own copy of the list of codes that end it. Only up.go learned
about codes.FailedPrecondition, so a refused `netbird login` kept retrying and
then reported "login backoff cycle failed" instead of what the daemon said.

terminalLoginError is now that list, once, next to WithBackOff — the duplicated
copies are what let the two commands disagree in the first place.

Reported by cubic-dev-ai on PR #7398.

client/cmd/up.go

@@ -403,11 +403,7 @@ func doDaemonUp(ctx context.Context, cmd *cobra.Command, client proto.DaemonServ
 	err = WithBackOff(func() error {
 		var backOffErr error
 		loginResp, backOffErr = client.Login(ctx, loginRequest)
-		if s, ok := gstatus.FromError(backOffErr); ok && (s.Code() == codes.InvalidArgument ||
-			s.Code() == codes.PermissionDenied ||
-			s.Code() == codes.NotFound ||
-			s.Code() == codes.FailedPrecondition ||
-			s.Code() == codes.Unimplemented) {
+		if terminalLoginError(backOffErr) {
 			loginErr = backOffErr
 			return nil
 		}