test: failing behaviour on sandboxed Proxy

CopyProperties() causes sandboxed Proxy to throw error
when in fact no code has been run. The function will
be removed with the updates to the V8 API.

Here, failing Proxy test case is moved to known_issues.

PR-URL: https://github.com/nodejs/node/pull/11671


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>