Remove platform.start()

[stavros11]

As of qiboteam/qibolab#739, platform.start(), setup() and stop() will not be available.

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.
• Compatibility with Qibo modules (Please edit this section if the current pull request is not compatible with the following branches).
  • Qibo: master
  • Qibolab: main
  • Qibolab_platforms_qrc: main

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5061441) 96.01% compared to head (892fe70) 95.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #688      +/-   ##
==========================================
- Coverage   96.01%   95.98%   -0.04%     
==========================================
  Files         106      106              
  Lines        7356     7349       -7     
==========================================
- Hits         7063     7054       -9     
- Misses        293      295       +2     

Flag	Coverage Δ
unittests	95.98% <100.00%> (-0.04%)	⬇️

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

Files	Coverage Δ
src/qibocal/cli/acquisition.py	100.00% <100.00%> (ø)
src/qibocal/cli/autocalibration.py	100.00% <100.00%> (ø)
src/qibocal/cli/utils.py	74.13% <100.00%> (ø)
...acterization/resonator_spectroscopy_attenuation.py	98.85% <100.00%> (ø)
...ation/signal_experiments/time_of_flight_readout.py	100.00% <ø> (ø)
.../characterization/two_qubit_interaction/chevron.py	95.41% <ø> (-1.53%)	⬇️
src/qibocal/update.py	96.11% <ø> (-0.15%)	⬇️
src/qibocal/utils.py	100.00% <100.00%> (ø)

[Jacfomg]

Just tried it for Zurich, it works