[hooks/syncschema] do not crash on double removal of a constraint Some complicated migrations may entail a double constraint removal. It is not yet known whether this is a genuine cw bug or the result of a complicated migration story, but we should nevertheless not crash. Rather, emit a CRITICAL warning and proceed. Closes #3595309.

+
−usr/bin/cubicweb-ctl usr/bin/
+
−usr/lib/PY_VERSION/*-packages/cubicweb/cwctl.py
+
−../cubicweb-ctl.bash_completion etc/bash_completion.d/cubicweb-ctl