Compatibility with the new Qibo global backend handling

[alecandido]

qiboteam/qibo#1440 (comment)

Qibocal is not directly broken, until the next Qibo release.

Still, we want to have a strategy ready for when this release will happen (soon), and it will break Qibolab itself.
Qibo has no well-defined public API, and so this breaking change will happen in a minor version - thus leading to breakage if installed with the latest release.

In any case, all Qibolab users are invited to keep using Qibo v0.2.12 until the next Qibocal release, if they use a release. Otherwise, hopefully this will be soon ready to be merged in https://github.com/qiboteam/qibocal/tree/main

[alecandido]

@igres26, if you already tested and got an error, try to take a look at this branch, and please if there is any further error being raised.

I'm also scanning and checking other possible usages that are prone to fail because of qiboteam/qibo#1440.
I will even properly test later on, but for the time being, it was just a quick fix in case someone needs to use Qibocal's and Qibolab's development versions (which I hope no one is doing, but I don't know).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.51%. Comparing base (5ff3d90) to head (6919e9f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1022   +/-   ##
=======================================
  Coverage   97.50%   97.51%           
=======================================
  Files         124      124           
  Lines        9833     9831    -2     
=======================================
- Hits         9588     9587    -1     
+ Misses        245      244    -1     

Flag	Coverage Δ
unittests	97.51% <100.00%> (+<0.01%)	⬆️

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

Files with missing lines	Coverage Δ
...qibocal/protocols/randomized_benchmarking/utils.py	95.78% <100.00%> (-0.02%)	⬇️
src/qibocal/protocols/readout_mitigation_matrix.py	100.00% <100.00%> (ø)
src/qibocal/protocols/state_tomography.py	98.65% <100.00%> (ø)
...l/protocols/two_qubit_interaction/chsh/protocol.py	97.66% <100.00%> (ø)
...rc/qibocal/protocols/two_qubit_state_tomography.py	99.29% <100.00%> (ø)

... and 2 files with indirect coverage changes