[gn] Fix config for icu data file and swarming

gni/isolate.gni

 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/sanitizers/sanitizers.gni")
+import("//third_party/icu/config.gni")
 import("v8.gni")
 
 declare_args() {
   # Sets the test isolation mode (noop|prepare|check).
   v8_test_isolation_mode = "noop"
 }
 
 template("v8_isolate_run") {
   # Remember target name as within the action scope the target name will be
   # different.
@@ skipping 145 matching lines @@
         ]
       } else {
         args += [
           "--config-variable",
           "msvs_version=0",
         ]
       }
     }
   }
 }