cubicweb #3227593 [source/native] wrong regexp detection for sqlserver integrity error [validation pending]

Hence unique together errors are not correctly reported.

prioritynormal
typebug
done in3.17.10
load0.200
load left0.000
closed by#eff262f5ec3f [source/native] fix sqlserver pattern matcher for unique constraints (closes #3227593)
patch[source/native] fix sqlserver pattern matcher for unique constraints (closes #3227593) [applied]