[core] Remove unnecessary exporter depencencies (#51763)

Signed-off-by: dentiny <dentinyhao@gmail.com>

Author: dentiny

BUILD.bazel

@@ -879,9 +879,7 @@ ray_cc_library(
         "@com_google_absl//absl/container:flat_hash_map",
         "@com_google_absl//absl/memory",
         "@com_google_absl//absl/strings",
-        "@com_google_googletest//:gtest",
-        "@io_opencensus_cpp//opencensus/exporters/stats/prometheus:prometheus_exporter",
-        "@io_opencensus_cpp//opencensus/exporters/stats/stdout:stdout_exporter",
+        "@com_google_googletest//:gtest_prod",
         "@io_opencensus_cpp//opencensus/stats",
         "@io_opencensus_cpp//opencensus/tags",
     ],
@@ -1999,6 +1997,7 @@ ray_cc_test(
     deps = [
         ":grpc_common_lib",
         ":test_service_cc_grpc",
+        "@com_google_googletest//:gtest_main",
     ],
 )