Fix update not working using qq fit

[andrea-pasquale]

While performing some tests I noticed that when using qq fit the update is not performed correctly.
This PR fixes this issue and it also simplifies the structure of Task.

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

Merging #536 (d8bec37) into main (aa89d58) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #536      +/-   ##
==========================================
+ Coverage   96.71%   96.72%   +0.01%     
==========================================
  Files          74       74              
  Lines        5380     5376       -4     
==========================================
- Hits         5203     5200       -3     
+ Misses        177      176       -1     

Flag	Coverage Δ
unittests	96.72% <100.00%> (+0.01%)	⬆️

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

Files	Coverage Δ
src/qibocal/auto/task.py	100.00% <100.00%> (+0.70%)	⬆️

[stavros11]

Thank you for the fix. I am not very familiar with the auto part of the code, so it would be great if someone more familiar with it also reviews, but I do not see anything annoying in terms of code.

I also tested the update with one and two routines in the runcard and it worked as expected for the dummy platform. On main it does not work in either case. It may be useful to add a test that checks whether update works.

[Edoardo-Pedicillo]

Thank @andrea-pasquale