Add script to reprocess data analysis from scratch

levin: This cherry-picks the latest version of the
'DataAnalysis_clearAndReprocessFromScratch' script from a customer
project. It's needed to successfully run the 'refresh' workflow [1]
and was perhaps forgotten to be added in !31.

[1] https://lab.nexedi.com/nexedi/wendelin/blob/04787344/bt5/erp5_wendelin/SkinTemplateItem/portal_skins/erp5_wendelin/ERP5Site_executeDataAnalysisList.py#L37