remove unused using statements

Author: mpeddada1

ci/abi-dumps/google_cloud_cpp_storage_grpc.expected.abi.dump.gz

@@ -302,7 +302,7 @@ export_libraries_bzl()
 #   other feature, or even if no features are enabled.
 # ~~~
 macro (google_cloud_cpp_enable_deps)
-    list(APPEND GOOGLE_CLOUD_CPP_ENABLE monitoring trace opentelemetry)
+    list(APPEND GOOGLE_CLOUD_CPP_ENABLE monitoring trace opentelemetry universe_domain)
     if (__ga_libraries__ IN_LIST GOOGLE_CLOUD_CPP_ENABLE)
         list(APPEND GOOGLE_CLOUD_CPP_ENABLE ${GOOGLE_CLOUD_CPP_GA_LIBRARIES})
         list(APPEND GOOGLE_CLOUD_CPP_ENABLE

cmake/GoogleCloudCppFeatures.cmake

@@ -37,27 +37,16 @@ namespace {
 using ::google::cloud::golden_v1_testing::MockRequestIdServiceStub;
 using ::google::cloud::testing_util::InstallSpanCatcher;
 using ::google::cloud::testing_util::OTelAttribute;
-using ::google::cloud::testing_util::OTelContextCaptured;
 using ::google::cloud::testing_util::SpanHasAttributes;
-using ::google::cloud::testing_util::SpanHasInstrumentationScope;
-using ::google::cloud::testing_util::SpanKindIsClient;
 using ::google::cloud::testing_util::SpanNamed;
-using ::google::cloud::testing_util::SpanWithStatus;
 using ::google::cloud::testing_util::ThereIsAnActiveSpan;
 using ::google::cloud::testing_util::ValidatePropagator;
 using ::google::test::requestid::v1::CreateFooRequest;
 using ::google::test::requestid::v1::Foo;
-using ::google::test::requestid::v1::ListFoosRequest;
-using ::google::test::requestid::v1::ListFoosResponse;
 using ::google::test::requestid::v1::RenameFooRequest;
-using ::testing::_;
-using ::testing::ByMove;
 using ::testing::ElementsAre;
-using ::testing::Eq;
 using ::testing::IsEmpty;
 using ::testing::Not;
-using ::testing::ResultOf;
-using ::testing::Return;
 
 Status TransientError() {
   return Status(StatusCode::kUnavailable, "try-again");