Run download only once for playwright tests (#432)

Instead of using globalSetup (which runs once per worker), we just
download the vscode we want to use in a pre-test script.

Author: paul-sachs

package.json

@@ -295,6 +295,7 @@
     "lint": "biome lint --fix .",
     "test": "npm run test:integration && npm run test:playwright",
     "test:integration": "vscode-test",
+    "pretest:playwright": "node ./test/playwright/setup-script.mts",
     "test:playwright": "playwright test",
     "test:playwright:debug": "playwright test --debug --workers=1 --retries=0 --reporter=list",
     "package": "vsce package",

playwright.config.ts

@@ -15,7 +15,6 @@ export default defineConfig<TestOptions>({
   expect: {
     timeout: 40_000,
   },
-  globalSetup: "./test/playwright/global-setup.ts",
   projects: [
     {
       name: "VS Code insiders",

test/playwright/global-setup.ts

@@ -0,0 +1,7 @@
+// This file is run before all tests are run and is just used to prep 
+// the environment for the tests. It is run only once regardless of how
+// many workers are invoked.
+
+import { downloadAndUnzipVSCode } from "@vscode/test-electron";
+
+await downloadAndUnzipVSCode("insiders");