doc: update Linux perf test status in our CI

We have tests for Linux perf under `test/v8-updates/test-linux-perf.js`,
and those tests are run as part of the `node-test-commit-v8-linux` job.

PR-URL: https://github.com/nodejs/node/pull/22588


Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>