worker: add ref/unref to web workers

[avivkeller]

Fixes #43583 (comment) by adding the non-standard ref and unref methods.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.13%. Comparing base (453f47a) to head (2695065).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #65507      +/-   ##
==========================================
- Coverage   90.14%   90.13%   -0.02%     
==========================================
  Files         751      751              
  Lines      252709   252722      +13     
  Branches    47557    47567      +10     
==========================================
- Hits       227800   227783      -17     
- Misses      16206    16212       +6     
- Partials     8703     8727      +24     

Files with missing lines	Coverage Δ
lib/internal/webworker.js	92.79% <100.00%> (+0.09%)	⬆️

... and 28 files with indirect coverage changes

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