DESK_REJECT added

[umair-nasir14]

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A DESK_REJECT status added, primarily for Journal events. To facilitate emails for this status, two new email templates added for journal desk reject and reject. A reason is also propagated to the email for desk_reject and reject, which is propogated through outcome services, therefore a new reason column is added in the outcome table. Finally, all migrations are performed.

Please let me know if there are any changes needed!