fix: kill browser process when 'taskkill' fails on Windows (#8352)

src/node/BrowserRunner.ts

@@ -186,7 +186,14 @@ export class BrowserRunner {
     if (this.proc && this.proc.pid && pidExists(this.proc.pid)) {
       try {
         if (process.platform === 'win32') {
-          childProcess.exec(`taskkill /pid ${this.proc.pid} /T /F`, () => {});
+          childProcess.exec(`taskkill /pid ${this.proc.pid} /T /F`, (error) => {
+            if (error) {
+              // taskkill can fail to kill the process e.g. due to missing permissions.
+              // Let's kill the process via Node API. This delays killing of all child
+              // proccesses of `this.proc` until the main Node.js process dies.
+              this.proc.kill();
+            }
+          });
         } else {
           // on linux the process group can be killed with the group id prefixed with
           // a minus sign. The process group id is the group leader's pid.