chore: added TestPoller.Stop

v1/core/pollers.go

@@ -197,6 +197,10 @@ func (tp *TestPoller) Start(_ context.Context) (<-chan model.Update, error) {
 	return tp.ch, nil
 }
 
+func (tp *TestPoller) Stop(_ context.Context) error {
+	return nil
+}
+
 func WithAddress(addr string) WebhookOption {
 	return newWhOption(func(opts *webhookOptions) {
 		opts.addr = addr