Keep the account of the sent declaration over an older one (hq issue 267)

The last report stored per node decides whether a release plan moves on,
and it was whichever arrived last. A report about a declaration the mesh
has moved past now records what it says about the machine but leaves the
account of the apply alone, so arrival order cannot undo the newer.

internal/inventory/nodes.go

@@ -851,9 +851,9 @@ func (i *Inventory) DoingOf(ctx context.Context, name string) (Doing, bool, erro
 	var d Doing
 	var failed []byte
 	err = i.store.Pool().QueryRow(ctx,
-		`select outcome, refused, failed, applied, at, failing_since, failures
+		`select outcome, refused, failed, applied, at, failing_since, failures, coalesce(declared, '')
 		 from node_report where node = $1`, node.ID).
-		Scan(&d.Outcome, &d.Refused, &failed, &d.Applied, &d.At, &d.Since, &d.Times)
+		Scan(&d.Outcome, &d.Refused, &failed, &d.Applied, &d.At, &d.Since, &d.Times, &d.Declared)
 	if errors.Is(err, pgx.ErrNoRows) {
 		return Doing{}, false, nil
 	}