JCMA should provide report on entities that will be duplicated with migration

Issue Summary

JCMA creates duplicate entities with migration, if an entity with same name already exists. But it does not provide a report with all such entities, it will be helpful for customers and partners post migration.

Steps to reproduce

• Create a migration plan from Server to cloud using JCMA and run migration into a site with already existing data.
• Post migration, you will notice that entities like groups, roles, custom fields etc have duplicates with word (migrated) added to them.

Expected Results

JCMA should provide a report of all entities that will be duplicate post migration so that customers know what they have to fix in cloud site.

Actual Results

Most of the already existing entities gets a duplicate entity after migration, like administrator(migrated) etc and customers have to look for all such entities post-migration.