fix(legacy): modern polyfill autodetection was injecting more polyfills than needed

[sapphi-red]

Description

Modern chunks are targeting "ESM + dynamic import + import.meta + async generator" but the polyfill detection was using { esmodules: true } as the target.

injected modern polyfills in legacy playground

before

 {
  'core-js/modules/es.symbol.description.js',
  'core-js/modules/es.symbol.async-iterator.js',
  'core-js/modules/es.array.iterator.js',
  'core-js/modules/web.dom-collections.iterator.js',
  'core-js/modules/es.error.cause.js',
  'core-js/modules/es.promise.js',
  'core-js/modules/web.url.js',
  'core-js/modules/web.url-search-params.js',
  'core-js/modules/web.url-search-params.delete.js',
  'core-js/modules/web.url-search-params.has.js',
  'core-js/modules/web.url-search-params.size.js',
  'core-js/modules/es.string.ends-with.js',
  'core-js/modules/esnext.set.difference.v2.js',
  'core-js/modules/esnext.set.intersection.v2.js',
  'core-js/modules/esnext.set.is-disjoint-from.v2.js',
  'core-js/modules/esnext.set.is-subset-of.v2.js',
  'core-js/modules/esnext.set.is-superset-of.v2.js',
  'core-js/modules/esnext.set.symmetric-difference.v2.js',
  'core-js/modules/esnext.set.union.v2.js',
  'core-js/modules/es.json.stringify.js',
  'core-js/modules/web.dom-exception.constructor.js',
  'core-js/modules/web.dom-exception.stack.js',
  'core-js/modules/web.dom-exception.to-string-tag.js',
  'core-js/modules/web.structured-clone.js',
  'core-js/modules/es.array.push.js'
}

after

{
  'core-js/modules/web.dom-collections.iterator.js',
  'core-js/modules/web.url.js',
  'core-js/modules/web.url-search-params.js',
  'core-js/modules/web.url-search-params.delete.js',
  'core-js/modules/web.url-search-params.has.js',
  'core-js/modules/web.url-search-params.size.js',
  'core-js/modules/es.error.cause.js',
  'core-js/modules/esnext.set.difference.v2.js',
  'core-js/modules/esnext.set.intersection.v2.js',
  'core-js/modules/esnext.set.is-disjoint-from.v2.js',
  'core-js/modules/esnext.set.is-subset-of.v2.js',
  'core-js/modules/esnext.set.is-superset-of.v2.js',
  'core-js/modules/esnext.set.symmetric-difference.v2.js',
  'core-js/modules/esnext.set.union.v2.js',
  'core-js/modules/web.dom-exception.stack.js',
  'core-js/modules/web.structured-clone.js',
  'core-js/modules/es.array.push.js'
}

Additional context

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

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[bluwy]

Good catch!