fix(code view): dark mode token updates

[wbarbee]

Summary

Coalesce dark and light syntax themes into a united theme that relies on new tokens with the following rules:

1. default to the global color-scheme attribute setting for system-based dark or light mode
2. maintain a darkTheme property that the dev can set to override the theme when desired

ADO Story or GitHub Issue Link

Code View ADO Task

Figma Link

Code View Updated Figma

To Do

• darkTheme override hierarchy
• check with UX on light background hex value for code view (it's not purely white)
• delete old syntax files when done

Testing Instructions

• currently, UX needs to update the token hex value for the light theme background:
  --kd-color-code-view-background | light-dark(#fafafc, #222527)

this will be updated as soon as available

Checklist

• Used Conventional Commit messages as outlined in the contributing guide.
  • Noted breaking changes (if any).
• Documented/updated all props, events, slots, parts, etc with JSDoc.
  • Ran the analyze command to update Storybook docs.
• Added/updated Stories with controls to cover all variants.
• Ran test locally to address any failures.
• Added/updated the Figma link for the Story's Design tab.
• Added any new component exports to the src/index.ts file

Screenshots

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[wbarbee]

1. I still see the copy link as a Tertiary button in Figma?
2. Hmm we didn't actually change the syntax colors at all, did we? I assumed those were already accessible?

ok, theming should finally be good now.

for 1 above, i can convert back to the tertiary button but the styles don't match the design

for 2 (and 3), i think this will likely be resolved with the updates Robert made to the background hex value on light mode

[brian-patrick-3]

LGTM, pending copy button design.

[srpriyankashetty]

Verified and looks fine in both Dark and light mode,
Please let me know if we are good with Copy button

[brian-patrick-3]

🎉 This PR is included in version 2.0.0-next.43 🎉

The release is available on:

• npm package (@next dist-tag)
• GitHub release

Your semantic-release bot 📦🚀