wasi: refactor and enable poll_oneoff() test

This commit refactors and enables the poll_oneoff() WASI test.
The refactor includes testing additional cases, as well as some
platform specific checks.

PR-URL: https://github.com/nodejs/node/pull/33521


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>