Revert "[OBMFULL-4544] - Add integration tests against InvalidItemException in SyncHandler"

This reverts commit a60b6fddcffb40e4b7ff58009d02d03075a44d3f.
Revert "[OBMFULL-4544] - Create a new InvalidItemException to handle"

This reverts commit 21c5998b5bb3ef0ecf6d79b2d99b73583544c02c.
Revert "[OBMFULL-4544] - Add Tests against BookClient & send InvalidContactException to Opush"

This reverts commit c32a3be12b50e43f142a43d78fd14651bce03abd.
Revert "[OBMFULL-4544] - Email should now be a valid email when creating or modifying a contact"

This reverts commit 2d0119e50dd267c5295c464410b9438450136ef2.