chore: use native type stripping of Node.js in node testing

[kt3k]

This PR starts using native type strip feature of Node.js to run tests in Node, and it fixes the CI on main.

This PR also does some clean ups.

• You can now directly execute deno task test:node without running npm install in _tools/node_test_runner dir beforehand.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.43%. Comparing base (148107e) to head (4caba86).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6339      +/-   ##
==========================================
+ Coverage   96.34%   96.43%   +0.09%     
==========================================
  Files         547      547              
  Lines       41755    41788      +33     
  Branches     6327     6338      +11     
==========================================
+ Hits        40228    40300      +72     
+ Misses       1486     1447      -39     
  Partials       41       41              

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[satyarohith]

LGTM