fix(useOverflowItems): fix useResizeObserver import

[kennylam]

Fixes resize observer import in useOverflowItems to use internal hook.

Changelog

Changed

• use internal useResizeObserver rather than external package
• update useResizeObserver tests

Testing / Reviewing

Everything should build and all CI flows should pass.

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 84.48%. Comparing base (a975063) to head (b65ac2d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #19560   +/-   ##
=======================================
  Coverage   84.48%   84.48%           
=======================================
  Files         373      373           
  Lines       14735    14735           
  Branches     4838     4890   +52     
=======================================
  Hits        12449    12449           
+ Misses       2139     2138    -1     
- Partials      147      148    +1     

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[carbon-automation]

Hey there! v11.84.0 was just released that references this issue/PR.