fix: remove forced test exit on windows (#1897)

Workaround for nodejs/node#56645

Author: achingbrain

src/test/node.js

@@ -1,4 +1,3 @@
-import os from 'os'
 import path from 'path'
 import { fileURLToPath } from 'url'
 import { execa } from 'execa'
@@ -65,10 +64,6 @@ export default async function testNode (argv, execaOptions) {
     args.push(...argv['--'])
   }
 
-  if (os.platform() === 'win32') {
-    args.push('--exit')
-  }
-
   // before hook
   const before = await argv.fileConfig.test.before(argv)
   const beforeEnv = before && before.env ? before.env : {}