test: check that --expose-internals is disallowed in NODE_OPTIONS

Add test cases that confirm that `--expose-internals` and
`--expose_internals` are disallowed in the NODE_OPTIONS environment
variable.

Author: juanarbol

test/parallel/test-cli-node-options-disallowed.js

@@ -25,6 +25,8 @@ disallow('-c');
 disallow('--interactive');
 disallow('-i');
 disallow('--v8-options');
+disallow('--expose_internals');
+disallow('--expose-internals');
 disallow('--');
 
 function disallow(opt) {