investigate flaky parallel/test-readline-async-iterators-destroy in CI

[gireeshpunathil]

• Version: master
• Platform: linux-containerized
• Subsystem: readline

not ok 1632 parallel/test-readline-async-iterators-destroy
  ---
  duration_ms: 0.177
  severity: fail
  exitcode: 1
  stack: |-
    events.js:194
          throw er; // Unhandled 'error' event
          ^
    
    Error: EBADF: bad file descriptor, read
    Emitted 'error' event on ReadStream instance at:
        at internal/fs/streams.js:183:12
        at FSReqCallback.wrapper [as oncomplete] (fs.js:480:5) {
      errno: -9,
      code: 'EBADF',
      syscall: 'read'
    }
  ...

ref: https://ci.nodejs.org/job/node-test-commit-linux-containered/nodes=ubuntu1804_sharedlibs_openssl111_x64/16239/consoleText

[addaleax]

This should be fixed by #30836 + #30837 (they are two fully unrelated issues, that’s why it’s 2 PRs)