refactor: delete useMergedRefs and use useMergeRefs from floating-ui

[adamalston]

Closes #17234

Short description

Deleted useMergedRefs and replaced its usages with useMergeRefs from @floating-ui/react.

Changelog

Changed

• Replaced useMergedRefs usages with useMergeRefs from @floating-ui/react.

Removed

• Deleted useMergedRefs.

Testing / Reviewing

yarn test packages/react

[netlify]

✅ Deploy Preview for v11-carbon-web-components ready!

Name	Link
🔨 Latest commit	1f0b7db
🔍 Latest deploy log	https://app.netlify.com/sites/v11-carbon-web-components/deploys/67ce0f656eab0e0008097b79
😎 Deploy Preview	https://deploy-preview-18796--v11-carbon-web-components.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[netlify]

✅ Deploy Preview for carbon-elements ready!

Name	Link
🔨 Latest commit	1f0b7db
🔍 Latest deploy log	https://app.netlify.com/sites/carbon-elements/deploys/67ce0f65449a24000840df10
😎 Deploy Preview	https://deploy-preview-18796--carbon-elements.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[netlify]

✅ Deploy Preview for v11-carbon-react ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	1f0b7db
🔍 Latest deploy log	https://app.netlify.com/sites/v11-carbon-react/deploys/67ce0f65060ae00008c3b80d
😎 Deploy Preview	https://deploy-preview-18796--v11-carbon-react.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.29%. Comparing base (fe90ac8) to head (1f0b7db).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #18796   +/-   ##
=======================================
  Coverage   84.29%   84.29%           
=======================================
  Files         409      409           
  Lines       14707    14707           
  Branches     4794     4845   +51     
=======================================
  Hits        12397    12397           
+ Misses       2157     2155    -2     
- Partials      153      155    +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.