cli/task: Allow to use backend name as task type in schedule command

In the CSV file consumed by the schedule command, allow to use the celery backend name as task type name because the mapping between a backend name and its task type name can be easily retrieved from the scheduler API and only the celery backend name is available in sentry events data.

Related to swh-core!407 (merged).

mentioned in merge request swh-core!407 (merged)

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Jenkins job DSCH/gitlab-builds #300 succeeded in 4 min 56 sec.
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• d3422dfe - 1 commit from branch swh/devel:master
• 9f1adc23 - cli/task: Allow to use backend name as task type in schedule command

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Jenkins job DSCH/gitlab-builds #305 succeeded in 4 min 46 sec.
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merged