Fix for #483 and jestjs/jest#14549

[fatso83]

Purpose (TL;DR) - mandatory

Fix the async time forwarders that seemed to not run enqueued micro-tasks.

Background (Problem in detail) - optional

See #483 for details

I will move the tests around, as they were used to just verify the original issue. Posting the draft here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f6ef392) 96.48% compared to head (25dc957) 96.49%.

❗ Current head 25dc957 differs from pull request most recent head 8b16f52. Consider uploading reports for the commit 8b16f52 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #485      +/-   ##
==========================================
+ Coverage   96.48%   96.49%   +0.01%     
==========================================
  Files           2        2              
  Lines         682      684       +2     
==========================================
+ Hits          658      660       +2     
  Misses         24       24              

Flag	Coverage Δ
unit	96.49% <100.00%> (+0.01%)	⬆️

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Files	Coverage Δ
src/fake-timers-src.js	96.51% <100.00%> (+0.01%)	⬆️

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[SimenB]

Nice 👍