feat: replace .eslintrc.js with .eslintrc.cjs

[mdonnalley]

Replaces .eslintrc.js with .eslintrc.cjs so that we can begin migrating plugins to ESM

@W-14009603@

[mshanemc]

QA notes:

generated 5.7.1-qa.0 for local testing

updated in plugin-user

✅ git status

Changes not staged for commit:
  (use "git add/rm <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        deleted:    .eslintrc.js
        modified:   package.json
        deleted:    test/.eslintrc.js
        modified:   yarn.lock

Untracked files:
  (use "git add <file>..." to include in what will be committed)
        .eslintrc.cjs
        test/.eslintrc.cjs

✅ test/.eslint.cjs extends: '../.eslintrc.cjs',