Merge pyodide_py into python_stdlib.zip. ### Description

Merges pyodide_py.tar into python_stdlib.zip. This reduces the number of network requests during the initialization.

The original intention of splitting pyodide_py.tar from pyodide.asm.data was to give users an option to provide custom files (#2023), which is now available by modifying python_stdlib.zip directly. So I think there is no reason to have both python_stdlib.zip and pyodide_py.tar.

### Checklists

- [x] Add a [CHANGELOG](https://github.com/pyodide/pyodide/blob/main/docs/project/changelog.md) entry
- [x] Add / update tests

package:
  name: wordcloud
  version: 1.8.2.2
  _disabled: true
  top-level:
    - wordcloud
requirements:
  run:
    - matplotlib
source:
  url: https://files.pythonhosted.org/packages/71/8b/0feea1341a29c645ca9dbc7f453b1101ee0725059977c7fce23e1bd75b83/wordcloud-1.8.2.2.tar.gz
  sha256: 523db887e47e840eb5c2e60428243bb1d7439fdc60f89626b17bafa1be64459c
about:
  home: https://github.com/amueller/word_cloud
  PyPI: https://pypi.org/project/wordcloud
  summary: A little word cloud generator
  license: MIT

package:
  name: wordcloud
  version: 1.8.2.2
  _disabled: true
  top-level:
    - wordcloud
requirements:
  run:
    - matplotlib
source:
  url: https://files.pythonhosted.org/packages/71/8b/0feea1341a29c645ca9dbc7f453b1101ee0725059977c7fce23e1bd75b83/wordcloud-1.8.2.2.tar.gz
  sha256: 523db887e47e840eb5c2e60428243bb1d7439fdc60f89626b17bafa1be64459c
about:
  home: https://github.com/amueller/word_cloud
  PyPI: https://pypi.org/project/wordcloud
  summary: A little word cloud generator
  license: MIT
