cubicweb #17219827 on migration p(db) choice, give the traceback to pdb if it's available [resolved]

When doing a "p(db)" choice on a migration error, right now pdb is launched after the answer of the question and not where the error occurs. Switch to sending the traceback of the exception on failure to launch pdb in a way more useful context (right now a lot of information is missing)

done in3.27.0
load left0.000
closed by#cc681b6fcffa [migration/pdb] add option to use pdb.post_mortem if traceback is provided
assigned to