fix(testing): close cypress web server correctly on windows

packages/cypress/plugins/cypress-preset.ts

@@ -1,11 +1,11 @@
 import { workspaceRoot } from '@nx/devkit';
 import { dirname, join, relative } from 'path';
-import { existsSync, lstatSync } from 'fs';
+import { lstatSync } from 'fs';
 
 import vitePreprocessor from '../src/plugins/preprocessor-vite';
 import { NX_PLUGIN_OPTIONS } from '../src/utils/constants';
 
-import { spawn } from 'child_process';
+import { exec, spawn } from 'child_process';
 import { request as httpRequest } from 'http';
 import { request as httpsRequest } from 'https';
 
@@ -75,9 +75,13 @@ function startWebServer(webServerCommand: string) {
   });
 
   return () => {
-    // child.kill() does not work on linux
-    // process.kill will kill the whole process group on unix
-    process.kill(-serverProcess.pid, 'SIGKILL');
+    if (process.platform === 'win32') {
+      serverProcess.kill();
+    } else {
+      // child.kill() does not work on linux
+      // process.kill will kill the whole process group on unix
+      process.kill(-serverProcess.pid, 'SIGKILL');
+    }
   };
 }