Perspective Menu Tree Object:

Allow opening URL on the same tab by adding open_external_urls_in_new_tab prop to each item and set it to True by default so it doesn't break existing behavior.

But this allows us to configure it to False, thereby ensuring navigation to a target can be done in the same tab too instead of forcibly opening in a new tab.

This will also ensure item target navigation won't break in Perspective Workstation since opening in new tab gets broken in Perspective Workstation (unresponsive).