migrate_extrinsic_metadata: Allow 'atom:title' as alternative to 'title'

Some revisions use it instead.

Resolves https://forge.softwareheritage.org/T2513#62434

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Migrated from D5440 (view on Phabricator)

Build is green

Patch application report for D5440 (id=19449)

Rebasing onto 39507b24...

Current branch diff-target is up to date.

Changes applied before test

commit ccaac113a088bafff7587cd7fa6dd3c50ad07cbb
Author: Valentin Lorentz <vlorentz@softwareheritage.org>
Date:   Wed Apr 7 14:20:01 2021 +0200

    migrate_extrinsic_metadata: Allow 'atom:title' as alternative to 'title'
    
    Some revisions use it instead.

See https://jenkins.softwareheritage.org/job/DSTO/job/tests-on-diff/1248/ for more details.

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