[WIP] refactor preact components so they make use of the Shadow DOM

[stefrado]

Summary

Issue References

• Taiga User Story:
• Taiga Issue:
• Taiga Dimpact Issue:
• Github Issue:

Checklist

• CHANGELOG.rst updated
  • Deployment notes added
    
  • Breaking changes flagged
    
• Documentation updated
• Codecov report reviewed for untested lines
• Storybook component updated/created
  
• Vitest tests added/updated
• Updated the docker-compose.yml environment variables
  • Created an issue in https://github.com/maykinmedia/charts/ for new
    environment variables