test: remove test-v8-inspector-json-protocol test

Remove parallel/test-v8-inspector-json-protocol, it duplicates the test
found in inspector/test-inspector.

PR-URL: https://github.com/nodejs/node/pull/9184


Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: James M Snell <jasnell@gmail.com>