The new indexed data in error won't need this any more.

Related T1246#23691

This needs a fix in the pypi.loader repository (on its way)

I have difficulties naming things.

Examples (pypi):
- swh_task_args_0
- swh_task_args_1

Something is wrong somewhere in our logs stack.
In the mean time, kibana fetch logs deals with both.

Prior to this, the args/kwargs/exception were directly retrieved from
the swh_logging_{args|kwargs|exception} field. This is no longer the
case.

What possibly changed this was the migration between banco to the
elasticsearch cluster... When we were using banco, logstash might have
transformed the data. I no longer think we use a logstash to push the
logs?

With it, we have no result, without it, we can have data (cf. next
commit)

Reviewers: seirl, #reviewers

Reviewed By: seirl, #reviewers

Subscribers: ardumont

Differential Revision: https://forge.softwareheritage.org/D478

Summary: This avoids bugs/vulnerability with filenames containing a quote.

Reviewers: ardumont, moranegg, #reviewers

Reviewed By: ardumont, #reviewers

Differential Revision: https://forge.softwareheritage.org/D474

update current stats accordingly

[1] https://forge.softwareheritage.org/diffusion/SPRE/

Related T1069

Related T1071

+ add docstring