Issue Summary

The v2 REST APIs can be used to create and retrieve comments against attachments. For example:

GET /wiki/api/v2/attachments/{id}/footer-comments

will return comments for the given attachment. However, when that attachment is updated (ex: a user uploads a newer version of the attachmenton the UI), the same GET call returns an empty results array.

The v2 APIs should provide a way to retrieve the comments on the original attachment. For example, the v1 API provides a version param to specify the version of the attachment to retrieve comments for. Or the same call should retrieve the same comments made on the original attachment.