src: remove trace_sync_io_ from env

This commit removes trace_sync_io_ and instead uses the options value
directly.

PR-URL: https://github.com/nodejs/node/pull/22726


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>