feat: adds fluidDropdown in WebComponents

[2nikhiltom]

Closes 20330

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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
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.61%. Comparing base (6e1243f) to head (c2c2472).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #21101   +/-   ##
=======================================
  Coverage   92.60%   92.61%           
=======================================
  Files         515      515           
  Lines       38225    38225           
  Branches     5871     5867    -4     
=======================================
+ Hits        35399    35401    +2     
+ Misses       2676     2675    -1     
+ Partials      150      149    -1     

Flag	Coverage Δ
main-packages	85.61% <ø> (ø)
web-components	96.89% <ø> (+<0.01%)	⬆️

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