Add migrations for Contributor tasks and related files.
Merged
requested to merge issue/drupalorg_migrate-3485712:3485712-migrate-contributor-tasks into 1.0.x
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Closes #3485712
To test:
drush mim drupalorg_migrate_contributor_task_upload_files
drush mim drupalorg_migrate_contributor_task_upload_media_images
drush mim drupalorg_migrate_contributor_task_upload_media_documents
drush mim drupalorg_migrate_contributor_task