perf_hooks: remove non-existent entries from inspect

Some of the milestones was removed in PR #21247 but entries not removed
from function for inspect PerformanceNodeTiming.

PR-URL: https://github.com/nodejs/node/pull/29528


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>