cli.admin: Add remaining coverage on `swh deposit reschedule` cli
This adds the remaining missing coverage on the swh deposit reschedule
cli.
This also clarifies the messages in the runtime code, this serves multiple purposes:
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- message were not always clear
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- allows to use f-string which clarifies technically the code
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- ultimately, the coverage is then shown by jenkins in this very diff...
This cli allows to reschedule deposit ingestions which failed or got missed for some reason.
Test Plan
tox
Migrated from D4256 (view on Phabricator)