Revert "fix(dropdown): align styles and behavior with React parity"

[riddhybansal]

Reverts #20863

Web components CI is failing.

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[codecov]

Codecov Report

❌ Patch coverage is 98.87640% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.39%. Comparing base (18b87e5) to head (aca4ec6).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...web-components/src/components/dropdown/dropdown.ts	98.76%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21037      +/-   ##
==========================================
+ Coverage   85.57%   92.39%   +6.81%     
==========================================
  Files         357      515     +158     
  Lines       14501    37629   +23128     
  Branches     4843     5740     +897     
==========================================
+ Hits        12409    34766   +22357     
- Misses       1953     2714     +761     
- Partials      139      149      +10     

Flag	Coverage Δ
main-packages	85.57% <ø> (ø)
web-components	96.66% <98.87%> (?)

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