Concurrent runs of the full and incremental launchpad lister are generating conflicting states

https://sentry.softwareheritage.org/organizations/swh/issues/8972/?referrer=phabricator_plugin

StaleData: Stale data; Lister state not updated
(2 additional frame(s) were not displayed)
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  File "swh/core/api/negotiation.py", line 153, in newf
    return f.negotiator(*args, **kwargs)
  File "swh/core/api/negotiation.py", line 81, in __call__
    result = self.func(*args, **kwargs)
  File "swh/core/api/__init__.py", line 460, in _f
    return obj_meth(**kw)
  File "swh/core/db/common.py", line 62, in _meth
    return meth(self, *args, db=db, cur=cur, **kwargs)
  File "swh/scheduler/backend.py", line 245, in update_lister
    raise StaleData("Stale data; Lister state not updated")

Stale data; Lister state not updated

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Migrated from T3962 (view on Phabricator)