chore: implement actual huge code correctly

Co-authored-by: Alois Klink <alois@aloisklink.com>

packages/mermaid/src/diagrams/flowchart/parser/flow-huge.spec.js

@@ -15,7 +15,7 @@ describe('[Text] when parsing', () => {
   describe('it should handle huge files', function () {
     // skipped because this test takes like 2 minutes or more!
     it.skip('it should handlehuge diagrams', function () {
-      const nodes = `A-->B;B-->A`.repeat(20000);
+      const nodes = ('A-->B;B-->A;'.repeat(415) + 'A-->B;').repeat(57) + 'A-->B;B-->A;'.repeat(275);
       flow.parser.parse(`graph LR;${nodes}`);
 
       const vert = flow.parser.yy.getVertices();