cubicweb #4618944 migration: help sqlserver [validation pending]

Sqlserver needs to be baby sitted.

prioritynormal
typebug
done in3.19.6
load0.500
load left0.000
closed by#d47c318f95b2 [migration/bootstrap] add explicit index removal for sqlserver, be tolerant to migration replay
patch[migration/bootstrap] add explicit index removal for sqlserver, be tolerant to migration replay [applied]