feat(side-panel): added figma code connect files

[jlongshore]

Closes #8395

What did you change?

Added code connect file for the side-panel web component. Also modified the React version to fix some TS errors I was seeing on my end

How did you test and verify your work?

Publishing to figma

PR Checklist

As the author of this PR, before marking ready for review, confirm you:

• Reviewed every line of the diff
• Updated documentation and storybook examples
• Wrote passing tests that cover this change
• Addressed any impact on accessibility (a11y)
• Tested for cross-browser consistency
• Validated that this code is ready for review and status checks should pass

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[netlify]

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✅ Deploy Preview for carbon-for-ibm-products ready!

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[codecov]

Codecov Report

❌ Patch coverage is 1.12360% with 88 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.28%. Comparing base (d3d2a2a) to head (810c0d8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8687      +/-   ##
==========================================
- Coverage   82.47%   81.28%   -1.20%     
==========================================
  Files         324      412      +88     
  Lines       10779    19018    +8239     
  Branches     3543     4225     +682     
==========================================
+ Hits         8890    15458    +6568     
- Misses       1889     3560    +1671     

Components	Coverage Δ
ibm-products	82.45% <0.00%> (-0.02%)	⬇️
ibm-products-web-components	79.73% <1.25%> (∅)

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