fix: collect all errors in removeFolders (microsoft#28239)

This PR fixes
microsoft#27790 (review).
Previously this function returns only the first error when some of the
promises fail. But the type annotation suggests that the original
intention was to collect all the errors. This commit fixes the error
values, and unexpected `TypeError: object is not iterable`.

packages/playwright-core/src/utils/fileUtils.ts

@@ -28,8 +28,8 @@ export async function mkdirIfNeeded(filePath: string) {
 
 export async function removeFolders(dirs: string[]): Promise<Error[]> {
   return await Promise.all(dirs.map((dir: string) =>
-    fs.promises.rm(dir, { recursive: true, force: true, maxRetries: 10 })
-  )).catch(e => e);
+    fs.promises.rm(dir, { recursive: true, force: true, maxRetries: 10 }).catch(e => e)
+  ));
 }
 
 export function canAccessFile(file: string) {