Fix Storybook build

Author: koesie10

.gitignore

@@ -22,4 +22,7 @@ artifacts/
 
 # E2E Reports
 **/playwright-report/**
-**/test-results/**
+**/test-results/**
+
+# Storybook artifacts
+**/storybook-static/**

extensions/ql-vscode/test/factories/model-editor/extension-pack.ts

@@ -1,13 +1,12 @@
 import type { ExtensionPack } from "../../../src/model-editor/shared/extension-pack";
-import { join } from "path";
 
 export function createMockExtensionPack({
   path = "/path/to/extension-pack",
   ...data
 }: Partial<ExtensionPack> = {}): ExtensionPack {
   return {
     path,
-    yamlPath: join(path, "codeql-pack.yml"),
+    yamlPath: `${path}/codeql-pack.yml`,
     name: "sql2o",
     version: "0.0.0",
     language: "java",