chore: enable playwright test extension in vscode (#13135)

* chore: enable playwright test extension in vscode

This enables using the vscode debugger in playwright tests

site/e2e/README.md

@@ -41,6 +41,15 @@ pnpm build
 pnpm playwright:test
 ```
 
+To run the playwright debugger from VSCode, just launch VSCode from the nix
+environment and have the extension installed.
+
+```shell
+# Optionally add '--command zsh' to choose your shell.
+nix develop
+code .
+```
+
 # Enterprise tests
 
 Enterprise tests require a license key to run.

site/e2e/reporter.ts

@@ -133,7 +133,14 @@ class CoderReporter implements Reporter {
   }
 }
 
-const logLines = (chunk: string): string[] => chunk.trimEnd().split("\n");
+const logLines = (chunk: string | Buffer): string[] => {
+  if (chunk instanceof Buffer) {
+    // When running in a debugger, the input to this is a Buffer instead of a string.
+    // Unsure why, but this prevents the `trimEnd` from throwing an error.
+    return [chunk.toString()];
+  }
+  return chunk.trimEnd().split("\n");
+};
 
 const exportDebugPprof = async (outputFile: string) => {
   const response = await axiosInstance.get(