Upgrade/replace jstree ahead of jQuery update

[joelit]

The current state of the package

https://packagist.org/packages/vakata/jstree https://github.com/vakata/jstree (Last update in Sep 2021)

Suggested alternatives

We could go for the latest release v3.3.12 Or we could explore using what's staged for v.4 https://github.com/vakata/jstree/tree/v.4.0