Refactor ESLint and npm ignore configurations; remove unused files

[bingenito]

Declutter workspace root:

• npmignore is unncessary as each package.json has dist section of allowed files
• whitesource is no longer used
• eslint ignore can be inside eslint config

[Copilot]

Copilot wasn't able to review any files in this pull request.

Files not reviewed (4)

• .eslintignore: Language not supported
• .eslintrc.json: Language not supported
• .npmignore: Language not supported
• .whitesource: Language not supported

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.98%. Comparing base (49adb72) to head (7fd5340).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #727   +/-   ##
=======================================
  Coverage   73.98%   73.98%           
=======================================
  Files          16       16           
  Lines        1507     1507           
  Branches      317      301   -16     
=======================================
  Hits         1115     1115           
- Misses        367      392   +25     
+ Partials       25        0   -25     

Flag	Coverage Δ
unittests	73.98% <ø> (ø)

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see 4 files with indirect coverage changes

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