Fixed task progress report for 3rdparty users

[bsekachev]

Motivation and context

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

❗ No coverage uploaded for pull request base (develop@66fb026). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #6834   +/-   ##
==========================================
  Coverage           ?   82.48%           
==========================================
  Files              ?      369           
  Lines              ?    39790           
  Branches           ?     3547           
==========================================
  Hits               ?    32821           
  Misses             ?     6969           
  Partials           ?        0           

Components	Coverage Δ
cvat-ui	77.47% <ø> (?)
cvat-server	86.88% <ø> (?)

📢 Have feedback on the report? Share it here.

[bsekachev]

@nmanovic Could you please look at the PR?

[nmanovic]

LGTM