fix: terminate workers, when closing process (#2645)

* feat: destroy workers, when closing process

* chore: terminate all workers when closing pool

Author: sheremet-va

packages/vitest/src/node/pool.ts

@@ -127,7 +127,9 @@ export function createPool(ctx: Vitest): WorkerPool {
 
   return {
     runTests: runWithFiles('run'),
-    close: async () => {}, // TODO: not sure why this will cause Node crash: pool.destroy(),
+    close: async () => {
+      await Promise.all(pool.threads.map(w => w.terminate()))
+    },
   }
 }