Courseography / courseography / 2d148954-5f45-4c5e-8b69-ced113ce2ab0

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Upgraded to Babel 8 (#1751)

Bumps @babel/core, @babel/preset-env, @babel/preset-react,
@babel/eslint-parser, babel-loader, and babel-jest to their Babel
8-compatible majors. preset-env's useBuiltIns/corejs options were
removed upstream in v8, so polyfilling is now handled by the
babel-plugin-polyfill-corejs3 plugin instead.

Verified: yarn test (196/196), yarn build, webpack.dev.js build, and
yarn eslint all pass clean.

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

503 of 964 branches covered (52.18%)

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