chore: fix eslint config

[rauno56]

My text editor was yelling at me for the broken eslint config.

• ignored build/**,
• fixed references in backwards-compatibility projects - they must've been left unattended after SDK-API repo split.

Everything else unchanged.

[codecov]

Codecov Report

Merging #79 (9c9a1db) into main (f667325) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
- Coverage   94.70%   94.61%   -0.10%     
==========================================
  Files          42       36       -6     
  Lines         567      557      -10     
  Branches       94       93       -1     
==========================================
- Hits          537      527      -10     
  Misses         30       30              

Impacted Files	Coverage Δ
webpack.node-polyfills.js
src/platform/browser/globalThis.ts
karma.conf.js
karma.base.js
src/platform/browser/index.ts
karma.webpack.js

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f667325...9c9a1db. Read the comment docs.