coupler_chevron improvements

[hay-k]

• Run acquisition in DISCRIMINATION mode. This makes it easier to interpret the results of the experiment.
• Sweeps the qubit flux pulse duration as well (in tandem with coupler flux pulse duration).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.47%. Comparing base (731c9b1) to head (f724746).
Report is 32 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1014      +/-   ##
==========================================
- Coverage   97.50%   97.47%   -0.03%     
==========================================
  Files         123      123              
  Lines        9722     9718       -4     
==========================================
- Hits         9479     9473       -6     
- Misses        243      245       +2     

Flag	Coverage Δ
unittests	97.47% <100.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/qibocal/protocols/couplers/coupler_chevron.py	100.00% <100.00%> (ø)
...protocols/two_qubit_interaction/chevron/chevron.py	99.27% <100.00%> (+0.01%)	⬆️

... and 1 file with indirect coverage changes

[Edoardo-Pedicillo]

Thanks @hay-k !

[andrea-pasquale]

Thanks @hay-k