【任务描述】
Add unit-tests that test the public functions of GlobalDictionary class
【解决方案】
Complete "BIULD.gn" in OpenHarmony/ark_js_runtime/ecmascript/tests, add a cpp named "global_dictionary_test.cpp" in OpenHarmony/ark_js_runtime/ecmascript/tests
【任务来源】
The "global_dictionary.cpp" in OpenHarmony/ark_js_runtime/ecmascript need unit-tests to test their public functions