Increase buffer size for result channel in gRPC product retrieval; modify error handling to return nil instead of skipping retry

internal/ozon/products/adapter_grpc.go

@@ -29,7 +29,7 @@ func RegisterAdapterGRPC(server *grpc.Server, marketplaceRepo marketplace.Reposi
 func (g *AdapterGRPC) GetListOfProducts(req *pb.GetListOfProductsRequest, stream pb.ProductsService_GetListOfProductsServer) error {
 	ctx := stream.Context()
 	fmt.Printf("GetListOfProducts called with req: %+v\n", req.MarketplaceId)
-	resultChan := make(chan []pb.Product)
+	resultChan := make(chan []pb.Product, 10)
 	errChan := make(chan error)
 
 	go g.repo.StreamAllProductsCache(ctx, int(req.MarketplaceId), resultChan, errChan) // Запускаем в горутине