Dry run changelog show documents created

Currently setting dryRun: true shows a before and after (if there's changes) on the documents we are migrating over. Sometimes migrations create documents in other tables or update documents in other tables and it would be great to have a full trace of what has been updated.

Start by locating the dryRun handling and the code that produces the current before-and-after document output. Trace a migration that creates or updates documents in another table, then define the full trace so those changes are shown as well; done means dry runs report all affected documents without applying changes.

Written by the indexing model from the issue text.