CI: Consolidate Test/Coverage Steps for JS/JVM targets

[KetanReddy]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.21%. Comparing base (fdd3250) to head (62be8b1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #810      +/-   ##
==========================================
+ Coverage   85.83%   94.21%   +8.37%     
==========================================
  Files         505      147     -358     
  Lines       22828     7279   -15549     
  Branches     2660        0    -2660     
==========================================
- Hits        19595     6858   -12737     
+ Misses       2906      421    -2485     
+ Partials      327        0     -327     

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