fix(settings.ts): add cds-icon-button and cds-slug to the selectorTabbable string

[makafsal]

Closes #20065

Changelog

New

• added cds-icon-button and cds-slug to the selectorTabbable string

Testing / Reviewing

Verify in the packages/web-components/src/globals/settings.ts file.

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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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.39%. Comparing base (b56c1b8) to head (92e1200).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #20067   +/-   ##
=======================================
  Coverage   91.39%   91.39%           
=======================================
  Files         485      485           
  Lines       31370    31370           
  Branches     5480     5430   -50     
=======================================
  Hits        28670    28670           
- Misses       2546     2547    +1     
+ Partials      154      153    -1     

Flag	Coverage Δ
main-packages	84.93% <ø> (ø)
web-components	97.16% <ø> (ø)

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