ESLint: Remove legacy import suppressions

[ciampo]

Closes #81188.

What?

Completes the dependency-import lint migration by fixing the remaining 62 import/order violations and removing their bulk suppressions. It also removes stale dependency-group comments from documentation, generators, templates, and excluded configuration files.

Why?

The rules now run globally, but the remaining suppressions and unlinted examples still allowed the retired import style to persist or be generated again.

How?

• Makes the remaining import blocks contiguous and orders built-in dependencies before external and internal dependencies.
• Prunes every import/order entry from tools/eslint/suppressions.json.
• Updates contributor guidance and removes stale comments from documentation and scaffolding generators.
• Adds the merged bulk-cleanup commit to .git-blame-ignore-revs.
• Keeps dependency-group comments only in the lint rule's tests and documentation.

Testing Instructions

1. Run npm run lint:js -- --format compact --quiet --prune-suppressions.
2. Run npm run test:unit -- packages/eslint-plugin/rules/__tests__/dependency-group.js --runInBand.
3. Run npm run test:unit -- packages/docgen/test packages/readable-js-assets-webpack-plugin/test packages/env/lib/test --runInBand.
4. Run npm run -w packages/icons build and confirm it creates no additional tracked changes.

Testing Instructions for Keyboard

Not applicable. This PR has no user interface changes.

Use of AI Tools

This PR was authored with Codex and reviewed by the author.

[github-actions]

Size Change: 0 B

Total Size: 7.82 MB

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[github-actions]

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Co-authored-by: tyxla <tyxla@git.wordpress.org>
Co-authored-by: aduth <aduth@git.wordpress.org>

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[tyxla]

Nice 👍