Move tests outside src

[andrea-pasquale]

Aligning qiboijt with others qibo related projects where tests are outside src.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9c4d8cb) to head (3ff1d73).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main      #209    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           12         7     -5     
  Lines         1121       604   -517     
==========================================
- Hits          1121       604   -517     

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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[github-actions]

Run on QPU sim completed!

You can download the coverage report as an artifact, from the workflow summary page:
https://github.com/qiboteam/qibojit/actions/runs/13201234265