Swift: restore ArrayElement as an alias for CollectionElement

Author: rdmarsh2

swift/ql/lib/codeql/swift/dataflow/ExternalFlow.qll

@@ -497,6 +497,9 @@ predicate parseContent(AccessPathToken component, Content content) {
   or
   parseEnum(component, content)
   or
+  component.getName() = "ArrayElement" and
+  content instanceof Content::CollectionContent
+  or
   component.getName() = "CollectionElement" and
   content instanceof Content::CollectionContent
 }