Uninstall UXP

Uninstall UXP with up uxp uninstall.

A UXP install upgraded from Crossplane doesn’t support up uxp uninstall.
up uxp uninstall
The uninstall command assumes UXP is in the upbound-system namespace.

Uninstall UXP from a specific namespace with up uxp uninstall -n <NAMESPACE>

up uxp uninstall
up: error: uninstall: Release not loaded: universal-crossplane: release: not found

$ up uxp uninstall -n upbound-test