Reduce duplicate tracking of writes in changeset and state

[jeffa5]

trafficstars

    Unless I am missing something, this augments the changeset with all the writes, which mostly duplicate current->state except for deletes. Is that correct? If so, and if this is done for expediency, can we have a ticket that tracks that it's possible to optimise this in the future by adding only deletes here?

Originally posted by @achamayou in https://github.com/microsoft/CCF/pull/4352#discussion_r1014198531