swh.auth.django: Add parse decoded token to a OIDCUser utility func

Related to T3079

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Migrated from D5220 (view on Phabricator)

Some references in the commit message have been migrated:

• T3079 is now swh/meta#3079 (closed)

Build is green

Patch application report for D5220 (id=18702)

Rebasing onto 1951974f...

Current branch diff-target is up to date.

Changes applied before test

commit 91f47addee483e0ed1f7749a5f60feb73681cb58
Author: Antoine R. Dumont (@ardumont) <ardumont@softwareheritage.org>
Date:   Tue Mar 9 11:02:24 2021 +0100

    swh.auth.django: Add parse decoded token to a OIDCUser utility func
    
    Related to [T3079](https://forge.softwareheritage.org/T3079 'view original for T3079 on Phabricator')

See https://jenkins.softwareheritage.org/job/DAUTH/job/tests-on-diff/25/ for more details.

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