Danny d60a771024
GC: TWO Message attachments (#1014)
## Description
Introduces mock testing to ensure that objects with two or more attachments are restored properly.

Minor change to restore pipeline for failure. attachments are restored separately in the event that one of the attachments is corrupted. 

## Type of change

<!--- Please check the type of change your PR introduces: --->
- [x] 🌻 Feature
- [x] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🐹 Trivial/Minor

## Issue(s)

<!-- Can reference multiple issues. Use one of the following "magic words" - "closes, fixes" to auto-close the Github issue. -->
* closes #1007<issue>

## Test Plan

- [x]  Unit test
2022-10-03 20:59:03 +00:00
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