[test] Move cctest/test-hashcode to unittests/objects/

... hashcode-unittest.

Bug: v8:12781
Change-Id: I118ec1f2963abfaf6fbf738b97a984c9449d105d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3699498Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: 王澳 <wangao.james@bytedance.com>
Cr-Commit-Position: refs/heads/main@{#81103}

test/cctest/BUILD.gn

@@ -186,7 +186,6 @@ v8_source_set("cctest_sources") {
     "test-func-name-inference.cc",
     "test-global-handles.cc",
     "test-global-object.cc",
-    "test-hashcode.cc",
     "test-heap-profiler.cc",
     "test-icache.cc",
     "test-identity-map.cc",

test/unittests/BUILD.gn

@@ -424,6 +424,7 @@ v8_source_set("unittests_sources") {
     "objects/concurrent-string-unittest.cc",
     "objects/concurrent-transition-array-unittest.cc",
     "objects/elements-kind-unittest.cc",
+    "objects/hashcode-unittest.cc",
     "objects/managed-unittest.cc",
     "objects/modules-unittest.cc",
     "objects/object-unittest.cc",