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mw.Upload: Add details of error when uploading to stash

Description

mw.Upload: Add details of error when uploading to stash

Add a new method 'getStateDetails' to mw.Upload. The Upload.Booklet
layout uses this in the error message.

Bug: T114130
Change-Id: I932af41a7ae561774097c91f857d1daa39d8c49f