fix(session): Use transaction when closing orphaned connections

This was opening a transaction, but then calling the original reader
instead of using the reader/writer from the transaction. This would
result in a transaction being opend, then a separate transaction being
used to run the query, and finally the original transaction would
commit without any statements being executed.

internal/session/repository_connection.go

@@ -416,8 +416,8 @@ func (r *ConnectionRepository) closeOrphanedConnections(ctx context.Context, wor
 		ctx,
 		db.StdRetryCnt,
 		db.ExpBackoff{},
-		func(reader db.Reader, w db.Writer) error {
-			rows, err := r.reader.Query(ctx, fmt.Sprintf(orphanedConnectionsCte, notInClause), args)
+		func(_ db.Reader, w db.Writer) error {
+			rows, err := w.Query(ctx, fmt.Sprintf(orphanedConnectionsCte, notInClause), args)
 			if err != nil {
 				return errors.Wrap(ctx, err, op)
 			}