Full Synchronisation fails between Confluence and Crowd due to multiple users with the same External ID

Summary

Full Synchronisation fails between Confluence and Crowd due to multiple users with the same External ID

Steps to Replicate

More details can be found in the initial bug CWD-5182

Expected Outcome

Confluence should be able to manage this scenario and surface more information about the issue.

Actual Results

Full synchronization between Confluence and Crowd fails

Solution

Upgrade Embedded Crowd in order to benefit from the improvements that were implemented to better handle this edge case