Generated files are not being moved when submission is posted

[jennifer-richards]

Describe the issue

As noted in #8010 and #8015, the generated files for newly posted XML submissions are not being reliably moved into place. The result is that only the directly uploaded XML file is available.

Current theory is that this is due to a race between posting the submitted draft and the generated files appearing on the shared filesystem where they're stored. If the draft is posted before they are visible, the routine that does the copying will ignore them. There's some poking to do to confirm this as the cause, but if so, we need to ensure that such a race is accounted for.

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