Revert "reset-db__clean.cypher: remove constraints we no longer require"
Revert "reset-db__clean.cypher: remove constraints we no longer require"

This reverts commit 792ec339802271c79923016104e06ba10e8a64f8.

Dropping a non existant constraint is an error. The correct approach is
to list all constraings and then delete those, which requires scripting.

ozFri/rhizi,tlevine/rhizi,ozFri/rhizi,shlomif/rhizi,cben/rhizi,shlomif/rhizi,shlomif/rhizi,yuvadm/rhizi,ozFri/rhizi,cben/rhizi,yuvadm/rhizi,Rhizi/rhizi,ozFri/rhizi,cben/rhizi,shlomif/rhizi,Rhizi/rhizi,Rhizi/rhizi,tlevine/rhizi,yuvadm/rhizi,tlevine/rhizi,cben/rhizi,tlevine/rhizi,yuvadm/rhizi,Rhizi/rhizi