Improve save code now requests list
The display of the submitted "Save code now" requests list should be improved the following way:
- add a new column with a "Try again" button when a request has failed
- improve error description when a task failed if the error can be easily identified (for instance when a repository is not public and requires credentials)
See this proposed design as a reference.
Migrated from T2325 (view on Phabricator)