Improve users and groups sync when using migration tooling

Summary

When syncing users and group using one of the migration tools, if a user is found with a duplicate email or missing email at all, the tool will present a list with all the users in those conditions, asking the user to adjust those emails, in some cases, it's necessary to change the emails in the external directory (Crowd, LDAP, AD, etc).

Actual Results

The tools will provide a list of the users to be fixed and the changes that need to be made and attempt to sync the users and groups again.

Expected Results

It would be nice if the tool would allow the users to adjust or exclude accounts that are not meant to be migrated like service accounts, etc, without needing to edit their emails in the source, if there were options to adjust these emails within the app it would avoid problems when trying to sync the user/groups.