Investigate flaky test `parallel/test-stream-readable-to-web.js`

[Ethan-Arrowood]

Ref: nodejs/reliability#1250

Opening this issue after opening my PR with a potential fix.

Ironically, when this test was added, a reviewer called it out for being potentially flaky: https://github.com/nodejs/node/pull/48847/files#r1326913840