feat(unit-test): Improve chat script for creating unit tests

[skarllot]

Pull Request

Details on the issue fix or feature implementation

• Improve chat script for creating unit tests based on update unit tests chat script
• Fix README "Updating Unit Tests" sub-title

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.04%. Comparing base (77f117b) to head (d39a5e3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   54.98%   55.04%   +0.05%     
==========================================
  Files          71       71              
  Lines        1515     1517       +2     
  Branches      110      110              
==========================================
+ Hits          833      835       +2     
  Misses        666      666              
  Partials       16       16              

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