Move ESLint plugin inside packages/js

[dhruvkb]

Fixes

Fixes #4165 by @dhruvkb

Description

This PR lays the groundwork for placing Python subpackages in packages/python by moving the existing ESLint plugin inside packages/js.

Testing Instructions

CI should pass. That will test the ESLint package and confirm that it works because it itself is being used for linting the frontend.

Don't be daunted by the changed file count. Most of them are just renames packages/* → packages/js/*.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (if applicable).

Developer Certificate of Origin

Developer Certificate of Origin

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[github-actions]

Full-stack documentation: https://docs.openverse.org/_preview/4174

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Changed files 🔄:

• https://docs.openverse.org/_preview/4174/meta/ci_cd/jobs/packages.html
• https://docs.openverse.org/_preview/4174/packages/index.html

[obulat]

LGTM!

[sarayourfriend]

LGTM!