Fix GLOWS processing DE L1A

[maxinelasp]

Change Summary

GLOWS L1A processing has been failing because DE processing is kind of fragile. This refactors the way DE processing for L1A works to make it more resilient to weird packets, and adds a try/catch for a complicated piece to try and recover more aggressively.

Overview

• Update DE packet combining code to handle out of order packets, missing start packets, and missing end packets more reliably
• Update validation code to point to a new file (generated from the latest version of GLOWS example processing code)
• Removes old validation file, new one is part of downloaded data and is already in AWS
• also adds some more logging and error management

[subagonsouth]

This looks fine as is. Just a couple of minor suggestions to consider.