fix: extend logging of process timeout errors

[AriPerkkio]

• Related to Vitest hangs tests, close timed out after 1000ms #2008 (comment)

Log informative warning when something prevents Vite server from exiting. This is only done when pool (tests/workers) have successfully exited. If workers are stuck we'll log the name of the stuck test file as before: #3031.

This only adds more logging and does not solve the root cause. The root cause is typically in third party code so I'm still not sure how those cases could be caught.

Minimal reproduction:

import { defineConfig } from "vitest/config";
import chokidar from "chokidar";

export default defineConfig({
  plugins: [
    {
      name: "bad-plugin-preventing-vite-from-exiting",
      configureServer() {
        chokidar.watch("./").on("all", () => {});
      },
    },
  ],

  test: {
    reporters: ["verbose"],
  },
});

> example-project@1.0.0 test /x/y/vitest-example-project
> vitest run


 RUN  v0.31.1 /x/y/vitest-example-project

 ✓ tests/animals.test.ts (3)
   ✓ Dog says woof
   ✓ Dog doesn't meow
   ✓ Cat can't fly
 ✓ tests/math.test.ts (1)
   ✓ sum

 Test Files  2 passed (2)
      Tests  4 passed (4)
   Start at  11:44:15
   Duration  257ms (transform 48ms, setup 0ms, collect 33ms, tests 5ms, environment 0ms, prepare 112ms)

close timed out after 10000ms
Tests closed successfully but something prevents Vite server from exiting

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