additional emulator fixes

[lballerio]

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov]

Codecov Report

❌ Patch coverage is 67.96875% with 41 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.04%. Comparing base (0064190) to head (3aa05be).

Files with missing lines	Patch %	Lines
...qibolab/_core/instruments/emulator/engine/qutip.py	43.90%	23 Missing ⚠️
src/qibolab/_core/instruments/emulator/emulator.py	60.46%	17 Missing ⚠️
...olab/_core/instruments/emulator/engine/dynamiqs.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1499      +/-   ##
==========================================
- Coverage   39.50%   39.04%   -0.47%     
==========================================
  Files         119      120       +1     
  Lines        6219     6203      -16     
==========================================
- Hits         2457     2422      -35     
- Misses       3762     3781      +19     

Flag	Coverage Δ
unittests	39.04% <67.96%> (-0.47%)	⬇️

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[RoyStegeman]

Can this be closed now #1497 has been merged?

[lballerio]

also rebased on actual main after #1505 was merged into main.

[alecandido]

Last few comments, but they are very minor. It seems ready