build: add embedtest into native suite

[joyeecheung]

Instead of adding a separate command to run the embedtest, since it's now run by the node binary via tools/test.py and test/embedding/test-embedding.js, put embedding into the native suite in test scripts. This helps adding more embedding tests into the folder and run them automatically without listing them one by one in the scripts.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70783/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.52%. Comparing base (1bd7f62) to head (64e7b3c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #61357   +/-   ##
=======================================
  Coverage   88.51%   88.52%           
=======================================
  Files         704      704           
  Lines      208739   208739           
  Branches    40274    40277    +3     
=======================================
+ Hits       184770   184780   +10     
- Misses      15968    15980   +12     
+ Partials     8001     7979   -22     

see 43 files with indirect coverage changes

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