Fix missing repack sub-requests

Problem

Occasionally, repack requests end up loosing some of the sub-requests, which leaves them unable to complete as succeed or failed.

This issue aims at debugging and solving that issue.

added Repack Scheduler Backend priorityhigh typebug workflowin progress labels

assigned to @guenther and @afonso

marked this issue as related to #1067 (closed)

A fix for this issue was tried in #1067 (closed), but had to be reverted.

created branch 1094-fix-missing-repack-sub-requests to address this issue

mentioned in merge request !817

Is this issue reproducible ? Could we try our luck with: !809 ?