TMDM-7630 : "Error while running entity process "

Reintroduces missing changes following TMDM-7192 changes (missing content for update report ACTION generation).
Partially reintroduces update report generation (but *only* for ACTION update reports).
(https://jira.talendforge.org/browse/TMDM-7630)
(https://jira.talendforge.org/browse/TMDM-7192)
Merge branch 'maintenance/5.6'