platform.connect() when running CHSH with error mitigation

[stavros11]

Ports the fix of

qibocal/src/qibocal/protocols/two_qubit_interaction/mermin/protocol.py

Line 99 in 293e2a9

platform.connect()

in CHSH, because the platform is disconnected after the error mitigation routine (due to circuit execution).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.32%. Comparing base (293e2a9) to head (042d3cd).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1062   +/-   ##
=======================================
  Coverage   97.32%   97.32%           
=======================================
  Files         124      124           
  Lines        9893     9894    +1     
=======================================
+ Hits         9628     9629    +1     
  Misses        265      265           

Flag	Coverage Δ
unittests	97.32% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
...l/protocols/two_qubit_interaction/chsh/protocol.py	97.67% <100.00%> (+0.01%)	⬆️