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

internal/wb/products/adapter_grpc.go

@@ -27,7 +27,7 @@ func RegisterAdapterGRPC(server *grpc.Server, marketplacesRepository marketplace
 }
 func (a *AdapterGRPC) GetProducts(req *pb.GetProductsRequest, stream pb.ProductsService_GetProductsServer) error {
 	ctx := stream.Context()
-	resultChan := make(chan []pb.Product)
+	resultChan := make(chan []pb.Product, 10)
 	errChan := make(chan error)
 	go a.repo.StreamAllProductsCache(ctx, int(req.MarketplaceId), resultChan, errChan)
 	for {