Update .eslintignore

[DoctorLambda]

Note

Revamps .eslintignore to better target generated, coverage, log, and env files while retaining source and config files.

• ESLint:
  • Overhauls .eslintignore with organized sections and guidance comments.
  • Adds ignores for build/generated outputs (artifacts/, cache/, typechain/, typechain-types/, dist/, build/), coverage (coverage/, coverage.json, .solcover.js.report), system/log files (.DS_Store, Thumbs.db, *.log, npm-debug.log, yarn-error.log), and security files (.env, .env.local).
  • Stops ignoring key sources/configs by removing contracts/, .solcover.js, and .eslintrc.js from ignore list.

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