Resolve "Upgrading pyicat-plus causes running nexus writers to fail"

Closes #31 (closed)

When deploying the current version at the beamline we would caused the running NeXus writers to fail

https://gitlab.esrf.fr/bliss/bliss/-/blob/master/blisswriter/src/blisswriter/writer/scan.py#L648

Keep a minimal .xml file for this specific case for the next release. We can remove it after that.