[RM-8395] Fix sonarQube bug in run_classification method

Created on 2023-10-06 09:18:01 by Gaelle Daste. % Done: 100

SonarQube message :
Introduce a new variable or use its initial value before reassigning 'object_type'

object_type is an argument but not used. In the method, we loop over the object and use the same variable name, we have to change it.