test: do not skip test-http-server-consumed-timeout

test-http-server-consumed-timeout has code to that causes it to be
skipped on busy machines. Instead, use an exponential backoff for the
timeout if the machine is busy.

PR-URL: https://github.com/nodejs/node/pull/30677


Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>