test: remove unused file

This removes a source file that got re-added via a rebase.
It seems somewhere around change set
178dff255f
`entry_point.c` was removed, and rebase
0b6e16f1ae
added it back. The review of https://github.com/nodejs/node/pull/48740
overlooked this and the file got re-committed.

PR-URL: https://github.com/nodejs/node/pull/50528
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Vladimir Morozov <vmorozov@microsoft.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

test/js-native-api/test_cannot_run_js/entry_point.c

@@ -1,7 +0,0 @@
-#include <node_api.h>
-
-EXTERN_C_START
-napi_value Init(napi_env env, napi_value exports);
-EXTERN_C_END
-
-NAPI_MODULE(NODE_GYP_MODULE_NAME, Init)