This enables the "automatic reconfig" changes added by Initial Sync Semantics (PM-1096). This makes use of the 'newlyAdded' field for config rewrites. The impact of this is more fully described in the design document and the downstream impacts outlined in PM-1096.
Description of Linked Ticket
It's being added with a feature flag, after adding full support, we should turn it on by default. This may have significant testing fallout.
Scope of changes
Impact to Other Docs
MVP (Work and Date)
Resources (Scope or Design Docs, Invision, etc.)