Add `duplicate` menu to file menu

[abose]

Describe the bug

Phoenix has duplicate file functionality.

This is not exposed in file menus, causing users to request the save-as function. We should add this option to file menu and working set menu.

Reproduction

No response

Expected behavior

No response

OS, Browser and Phoenix versions

Add to the following menus:

1. File menu:
2. working set menu

logs or debug stack trace if any

No response

Additional context

No response

[abose]

Done. closing.