perf: upload local/remote at the same time

Author: tyler-french

enterprise/server/byte_stream_server_proxy/BUILD

@@ -31,6 +31,8 @@ go_library(
         "@com_github_prometheus_client_golang//prometheus",
         "@io_opentelemetry_go_otel//attribute",
         "@org_golang_google_genproto_googleapis_bytestream//:bytestream",
+        "@org_golang_google_grpc//codes",
+        "@org_golang_google_grpc//status",
         "@org_golang_x_sync//errgroup",
     ],
 )
@@ -51,6 +53,7 @@ go_test(
         "//server/interfaces",
         "//server/metrics",
         "//server/remote_cache/byte_stream_server",
+        "//server/remote_cache/cachetools",
         "//server/remote_cache/chunking",
         "//server/remote_cache/content_addressable_storage_server",
         "//server/remote_cache/digest",
@@ -61,6 +64,7 @@ go_test(
         "//server/testutil/testenv",
         "//server/testutil/testfs",
         "//server/util/authutil",
+        "//server/util/bytebufferpool",
         "//server/util/compression",
         "//server/util/log",
         "//server/util/prefix",