Allow easier copying of element path

this issue was brought up by Ketenstandaard on the STH discord

Problem / goal

the current version of the front end shows element paths like so:

This isn't easily copy/pasteable and I have to delete spaces/linebreaks and insert the slashes.

What is the expected outcome?

FrontendV2 showed the path in a way that was easy to copy.

Solution design

Bring back the xpath to a node from V2 in the information panel in the treeview. Or: add a 'copy' icon somewhere around the title/path which is paste-able as a valid xpath