Replicate attachment data from docket reports to subdockets

[albertisfu]

In #4665 attachment page uploads belonging to dopeldockets are replicated to subdockets.

We should also consider replicating attachment data embedded within docket reports to subdockets.

This would require a different approach from the one used in #4665, as the process of merging attachment data is embedded within the add_docket_entries method.

In this case, we need to determine if it is ok to merge attachment data into subdockets without creating a PQ to track the content being merged.