fix: FIT-1030: Agreement Selected dropdown is broken

[yyassi-heartex]

This pull request simplifies the AgreementSelectedWrapper component in the TableHead by removing unnecessary state management related to the dropdown's open/close state. The logic now relies solely on the dropdown's internal state, streamlining the component.

screen-recorder-thu-nov-20-2025-21-57-32.webm

Component simplification:

• Removed the useState hook and all related logic (isOpen, setIsOpen, and onToggle) from the AgreementSelectedWrapper component, relying instead on the dropdown's own state management. ([[1]](https://github.com/HumanSignal/label-studio/pull/8860/files#diff-51ab382cac0e258f4e4a21289401f0fda6d405059dae8badcc56b0c9e2bc8d5dL3-R3), [[2]](https://github.com/HumanSignal/label-studio/pull/8860/files#diff-51ab382cac0e258f4e4a21289401f0fda6d405059dae8badcc56b0c9e2bc8d5dL75-L102))

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.42%. Comparing base (b8f542e) to head (8a04ac0).
⚠️ Report is 1 commits behind head on develop.

❗ There is a different number of reports uploaded between BASE (b8f542e) and HEAD (8a04ac0). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (b8f542e)	HEAD (8a04ac0)
pytests	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8860      +/-   ##
===========================================
- Coverage    66.73%   58.42%   -8.32%     
===========================================
  Files          812      554     -258     
  Lines        63804    40287   -23517     
  Branches     10790    10790              
===========================================
- Hits         42582    23537   -19045     
+ Misses       21218    16746    -4472     
  Partials         4        4              

Flag	Coverage Δ
lsf-e2e	52.42% <ø> (-0.01%)	⬇️
lsf-integration	49.10% <ø> (ø)
lsf-unit	8.35% <ø> (ø)
pytests	?

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