refactor: use Qdrant's Query API

[Anush008]

Description

This PR updates the Qdrant integration to use the new Query API that supersedes the search API.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 30.40%. Comparing base (0d5163b) to head (e25559c).

Files with missing lines	Patch %	Lines
autogen/agentchat/contrib/vectordb/qdrant.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3428      +/-   ##
==========================================
+ Coverage   29.72%   30.40%   +0.67%     
==========================================
  Files         113      113              
  Lines       12308    12308              
  Branches     2607     2607              
==========================================
+ Hits         3659     3742      +83     
+ Misses       8321     8237      -84     
- Partials      328      329       +1     

Flag	Coverage Δ
unittests	30.38% <0.00%> (+0.65%)	⬆️

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[jackgerrits]

@thinkall can you review?

[thinkall]

Thank you for the PR, @Anush008 ! LGTM.