process: properly close file descriptor on exit

[BridgeAR]

This makes sure the file descriptor is closed syncronously on exit
instead of using the asyncronous version which should not be used
on exit.

This is pulled out from #24965 as suggested by @addaleax.

Refs: https://github.com/nodejs/node/pull/24965/files#r240770314

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

[nodejs-github-bot]

@BridgeAR build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/1902/pipeline

CI https://ci.nodejs.org/job/node-test-pull-request/19436/
Resumed CI https://ci.nodejs.org/job/node-test-pull-request/19475/
Resumed CI https://ci.nodejs.org/job/node-test-pull-request/19483/

Resume Build CI: https://ci.nodejs.org/job/node-test-pull-request/19497/

AIX failures in CI were one known issue (#24921) that @gireeshpunathil is investigated but is currently awaiting access to the relevant AIX host (nodejs/build#1637), and one issue that I don't think is new but hasn't been reported to track it so I opened an issue (#25029).

Will open a PR to mark as flaky if they persist. In the meantime....

Resume Build CI: https://ci.nodejs.org/job/node-test-pull-request/19503/ ✔️

Landed in 80ab537