[Theming] Automatically convert light to dark

[zachstence]

Description

Automatically converts hardcoded colors to dark mode

E.g.

This DataTable has hardcoded colors for the bars:

Light mode

Dark mode (before, same colors used)

Dark mode (after, colors converted)

Checklist

• [x] For UI or styling changes, I have added a screenshot or gif showing before & after
• [ ] I have added a changeset
• [ ] I have added to the docs where applicable
• [ ] I have added to the VS Code extension where applicable