tools: fetch googletest dependency for V8 CI

gtest_prod.h is not enough to build V8's cctests.

Backport-PR-URL: #39470
PR-URL: #38990
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

tools/v8/fetch_deps.py

@@ -26,7 +26,6 @@
     "custom_deps" : {
       # These deps are already part of Node.js.
       "v8/base/trace_event/common"            : None,
-      "v8/third_party/googletest/src"         : None,
       # These deps are unnecessary for building.
       "v8/test/benchmarks/data"               : None,
       "v8/testing/gmock"                      : None,