Backport worker.performance.eventLoopUtilization()

[trevnorris]

Right now worker.performance.eventLoopUtilization() (in worker_threads) is only on v15.x. I request it also be backported to v14.x and v12.x like it was for perf_hooks.performance.eventLoopUtilization().

/cc @jasnell

[aduh95]

Refs: #35664

The PR was labelled semver-minor, it should be part of the next v14 semver-minor release. v12 being in maintenance mode, I'm afraid this ship has sailed.

[targos]

It's not impossible to backport semver-minor commits to branches in maintenance. It just doesn't happen automatically: https://github.com/nodejs/release#release-phases

[juanarbol]

I could give a try. :)

[richardlau]

The backports happened and went out in 14.17.0 and 12.22.0.