Remove jest tests from cvat-core

[bsekachev]

Motivation and context

From retrospective these tests are more useless. Typical scenario of them failing is updated server schema when server changed REST API, we updated cvat-core and everything works, but these tests fail as all the data in hardcoded and almost never updated. So, we decided to remove them as now we cover the whole client app using Cypress end-to-end testing.

How has this been tested?

Checklist

• I submit my changes into the develop branch
• I have created a changelog fragment
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (see GitHub docs)

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-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.38%. Comparing base (4191be3) to head (da81e2b).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8985      +/-   ##
===========================================
- Coverage    73.90%   73.38%   -0.52%     
===========================================
  Files          417      415       -2     
  Lines        44598    44184     -414     
  Branches      4031     3859     -172     
===========================================
- Hits         32960    32426     -534     
- Misses       11638    11758     +120     

Components	Coverage Δ
cvat-ui	77.35% <ø> (-1.05%)	⬇️
cvat-server	70.08% <ø> (ø)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud