Fix bug with scoping with * followed by aggregation and order by

Queries with `WITH *, count(a) AS c ORDER BY c RETURN c` was failing with `no variable c in scope`.

community/cypher/front-end/ast/src/main/scala/org/neo4j/cypher/internal/v3_5/ast/Clause.scala

@@ -669,7 +669,7 @@ sealed trait ProjectionClause extends HorizonClause {
       // can see both variables from before the WITH and variables introduced by the WITH
       // (SKIP and LIMIT clauses are not allowed to access variables anyway, so they do not need to be included in this condition even when they are standalone)
       val specialScopeForSubClausesNeeded = orderBy.isDefined || where.isDefined
-      val canSeePreviousScope = !(returnItems.containsAggregate | distinct)
+      val canSeePreviousScope = (!(returnItems.containsAggregate || distinct)) || returnItems.includeExisting
 
       if (specialScopeForSubClausesNeeded && canSeePreviousScope) {
         /*