[Draft] - use connection instead of sdk

[AurelienNober]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 156 lines in your changes missing coverage. Please review.
✅ Project coverage is 34.47%. Comparing base (79c5d81) to head (2cfa7c9).

Files with missing lines	Patch %	Lines
qek/data/extractors_v2.py	0.00%	128 Missing ⚠️
qek/target/backends.py	0.00%	16 Missing ⚠️
tests/test_backends.py	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #123      +/-   ##
==========================================
- Coverage   38.27%   34.47%   -3.80%     
==========================================
  Files          17       18       +1     
  Lines        1207     1340     +133     
  Branches      140      154      +14     
==========================================
  Hits          462      462              
- Misses        715      848     +133     
  Partials       30       30              

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