Add goja refactors in browser module to release notes

[ankur22]

What?

Add goja refactors in browser module to release notes.

Why?

Keep all users up-to-date with the latest changes.

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (make lint) and all checks pass.
• I have run tests locally (make tests) and all tests pass.
• I have commented on my code, particularly in hard-to-understand areas.

Related PR(s)/Issue(s)

Updates: grafana/xk6-browser#1162 & grafana/xk6-browser#1182.

[inancgumus]

LGTM 👍

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (release-v0.50.0@cdb1c40). Click here to learn what that means.

❗ Current head 464712f differs from pull request most recent head 77992eb. Consider uploading reports for the commit 77992eb to get more accurate results

Additional details and impacted files

@@                Coverage Diff                 @@
##             release-v0.50.0    #3578   +/-   ##
==================================================
  Coverage                   ?   72.96%           
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  Files                      ?      280           
  Lines                      ?    20949           
  Branches                   ?        0           
==================================================
  Hits                       ?    15286           
  Misses                     ?     4693           
  Partials                   ?      970           

Flag	Coverage Δ
macos	72.89% <0.00%> (?)
ubuntu	72.91% <0.00%> (?)
windows	72.82% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

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