Filter history for results involving AI assistant

When the AI assistant edits a record, the record's history indicates the change was made by a user as well as the AI assistant (example below). This is super helpful.

I also want to be able to see all history logs where the AI assistant was involved with an edit.

Makes it easy for admins to audit how the AI assistant is being used by PMs to manage Aha! records.

In history reporting, add a way to filter on if the log involved the AI assistant. Either from the User filter, or a new filter for AI assistant involvement.