fix(vitest): gracefully exit Vitest if process.exit is called inside the test

[sheremet-va]

Description

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[sheremet-va]

@AriPerkkio looks like we need more handling here - if you want to exit gracefully - awaiting runningPromise in this situation breaks exiting. Maybe instead of having onWorkerExit we just throw an error? 🤷🏻

[AriPerkkio]

Maybe instead of having onWorkerExit we just throw an error?

This would be better - show error and change exit code to erroneous one. Also show the test filename that caused the error if possible. I don't like the fact that right now we can forcefully exit while there are tests running. Exit should be done carefully and not like this.

[AriPerkkio]

Tested with #4441 by applying changes from here and making server.test.ts fail. Looks good and no zombie processes left in the background.

((HEAD detached at sheremet-va/feat/refactor-pool-worker)) $ pnpm run test --pool=forks --run

> @vitest/test-vite-node@ test /x/vitest/test/vite-node
> vitest "--pool=forks" "--run"


 RUN  v1.1.3 /x/vitest/test/vite-node

 ✓ test/sourcemap.test.ts (5)
 ✓ test/hmr.test.ts (1) 472ms
 ✓ test/circular.test.ts (2) 922ms
 ✓ test/self-export.test.ts (3) 1304ms
 ✓ test/cli.test.ts (8) 2929ms
 ✓ test/server.test.ts (2)

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Vitest caught 1 unhandled error during the test run.
This might cause false positive tests. Resolve unhandled errors to make sure your tests are not affected.

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Error: process.exit unexpectedly called with "0"
 ❯ process.exit ../../packages/vitest/src/runtime/execute.ts:51:11
 ❯ process.exitProcess ../../node_modules/.pnpm/vite@5.0.2_@types+node@18.18.9_less@4.1.3/node_modules/vite/dist/node/chunks/dep-ErEj4WmL.js:58526:25
 ❯ processTicksAndRejections node:internal/process/task_queues:95:5

This error originated in "test/server.test.ts" test file. It doesn't mean the error was thrown inside the file itself, but while it was running.
This error was caught after test environment was torn down. Make sure to cancel any running tasks before test finishes:
- cancel timeouts using clearTimeout and clearInterval
- wait for promises to resolve using the await keyword
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 Test Files  6 passed (6)
      Tests  21 passed (21)
     Errors  1 error
   Start at  19:52:52
   Duration  3.96s (transform 905ms, setup 1ms, collect 3.33s, tests 5.70s, environment 1ms, prepare 887ms)

 ELIFECYCLE  Test failed. See above for more details.