Allow spreadsheet migrate sources
>>> [!note] Migrated issue
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<!-- Migrated from issue #3132559. -->
Reported by: [hatuhay](https://www.drupal.org/user/827704)
Related to !10
>>>
<p>Allow spreadsheets migrations comming from the <a href="https://www.drupal.org/project/migrate_spreadsheet" title="Migrate Spreadsheet">Migrate Spreadsheet</a> module to be recognized.</p>
issue