fix: stylex.attrs doesn't work with dynamic styles when using multi-word properties

[chbybnwr]

fix: stylex.attrs doesn't work with dynamic styles when using multi-word properties

What changed / motivation ?

exclude generated custom properties set in style prop/attr from being converted to kebab case, to sync with the ones used in generated CSS.

Linked PR/Issues

Fixes #1709

Additional Context

Issue reproduction

Pre-flight checklist

• I have read the contributing guidelines
  Contribution Guidelines
• Performed a self-review of my code

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