Bugfix: Azure AI Search Tool - fix query type

[jay-thakur]

Why are these changes needed?

Hybrid & Semanic Query type Fix
updated fulltext query type

Related issue number

Closes #6321

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.90%. Comparing base (b13264a) to head (06b7f04).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ogen-ext/src/autogen_ext/tools/azure/_ai_search.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6331      +/-   ##
==========================================
- Coverage   77.91%   77.90%   -0.02%     
==========================================
  Files         209      209              
  Lines       15187    15189       +2     
==========================================
  Hits        11833    11833              
- Misses       3354     3356       +2     

Flag	Coverage Δ
unittests	77.90% <92.85%> (-0.02%)	⬇️

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