[v9.x backport] 17738 and 17841

[apapirovski]

Just required commits applied in the right order.

CI: https://ci.nodejs.org/job/node-test-pull-request/12857/

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Affected core subsystem(s)

process

[apapirovski]

Once this lands, #17736 #17881 #17879 #18139 should land and not fail the tests if applied in the right order.

[MylesBorins]

@apapirovski after landing this PR I am still seeing #17736 fail as below. Would it be possible for you to add all of those other blocked PRs to this backport PR and ensure everything is working

=== release test-timer-immediate ===
Path: parallel/test-timer-immediate
module.js:704
  process._tickCallback();
          ^

TypeError: process._tickCallback is not a function
    at Function.Module.runMain (module.js:704:11)
    at startup (bootstrap_node.js:190:16)
    at bootstrap_node.js:657:3

As an aside, #18139 was not landing cleanly

[apapirovski]

@MylesBorins working on this now. Should have an update shortly. Just an FYI, the unref Immediates in #18139 are semver-minor so will need to wait until 9.7.0 now.

[apapirovski]

I'm going to open a new PR for this given the expanded scope.