Ruby: Add consistency query for extraction errors

Author: hvitved

ruby/ql/consistency-queries/AstConsistency.ql

@@ -1,5 +1,6 @@
 import codeql.ruby.AST
 import codeql.ruby.ast.internal.Synthesis
+import codeql.ruby.Diagnostics
 
 query predicate missingParent(AstNode node, string cls) {
   not exists(node.getParent()) and
@@ -28,3 +29,5 @@ query predicate multipleToString(AstNode n, string s) {
   s = strictconcat(n.toString(), ",") and
   strictcount(n.toString()) > 1
 }
+
+query predicate extractionError(ExtractionError error) { any() }