Revert "XWIKI-7947: Attaching a file after a rollback restores previous attachments"

This reverts commit 62821f11f628a3ca090eb7a1776ed3b38116f54a.
Revert "XWIKI-7947: Attaching a file after a rollback restores previous attachments."

This reverts commit 4a02b100dbae6a5efcb607b76b3d4d807a97aa41.