ci: exclude yarn pnp sources from eslint checks

[MikeMcC399]

Issue

ESlint reports warnings from an externally sourced Yarn Plug'n'Play module:

github-action/examples/yarn-modern-pnp/.pnp.cjs
  8519:4   warning  Unused eslint-disable directive (no problems were reported from 'operator-linebreak')
  8570:10  warning  Unused eslint-disable directive (no problems were reported from 'no-undef')

Change

Add externally sourced Yarn Plug'n'Play modules to global ignore list of eslint.config.mjs

examples/**/.pnp.*

Verification

Ubuntu 22.04.2 LTS, Node.js 22.14.0 LTS

git clean -xfd
npm ci
corepack enable yarn
cd examples/yarn-modern-pnp
yarn
cd ../..
npx eslint

and confirm no ESLint warnings or errors are shown.

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[github-actions]

🎉 This PR is included in version 6.8.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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