Enable coverage collection in quality reports worker

[zhiltsov-max]

Motivation and context

• Added missing coverage collection in quality reports worker
• Fixed invalid worker class in webhooks worker

How has this been tested?

Checklist

• I submit my changes into the develop branch
• I have added a description of my changes into the CHANGELOG file
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (see GitHub docs)
• I have increased versions of npm packages if it is necessary
  (cvat-canvas,
  cvat-core,
  cvat-data and
  cvat-ui)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.

[codecov]

Codecov Report

Merging #6341 (3d8e2af) into develop (1a2365c) will increase coverage by 1.94%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #6341      +/-   ##
===========================================
+ Coverage    79.76%   81.70%   +1.94%     
===========================================
  Files          321      321              
  Lines        37329    37329              
  Branches      6756     6756              
===========================================
+ Hits         29774    30501     +727     
+ Misses        7288     6520     -768     
- Partials       267      308      +41     

Components	Coverage Δ
cvat-ui	77.13% <ø> (+0.03%)	⬆️
cvat-server	85.84% <ø> (+3.67%)	⬆️