If you need to, then arguably that information should be scrubbed before even pasting it into our site. So a tool hosted on our site, or a filter on our site, would not be sufficient to achieve what you ask. It seems more like that this should be a feature of XenForo itself or an add-on of XenForo, which would provide a button to view a scrubbed copy of the error log entry. I would recommend that you suggest such a feature to the XenForo devs. It would be redundant for every third-party add-on to provide separate scrubbers when the logged errors for all add-ons already appear in one place.