chore(fonts): revert previous fix, unquote unicode-range and font-display values only

[petersandor]

Partially reverts #19511

Changelog

Changed

• use unquoted unicode-range and font-display values by default

Testing / Reviewing

1. Start any Carbon sample page with the styles loaded (fonts included) in Firefox
2. Open developer tools and toggle CSS logging
3. Check for console messages mentioning unknown descriptor in unicode-range and font-display

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

More details can be found in the pull request guide

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.65%. Comparing base (639bce3) to head (bbc9757).
Report is 23 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #19588   +/-   ##
=======================================
  Coverage   84.65%   84.65%           
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  Files         373      373           
  Lines       14715    14715           
  Branches     4846     4848    +2     
=======================================
  Hits        12457    12457           
+ Misses       2108     2107    -1     
- Partials      150      151    +1     

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[preetibansalui]

Hi @petersandor, could you please remove the @use 'sass:string' import if it's no longer being used? I believe it was added in the previous PR.

[tay1orjones]

Nice 👍 Thanks again for this revision!

[preetibansalui]

Thanks for the changes