[#549][tests] Refactoring test setup

[BPylypenko]

• Separated test setups for specific tests from the major one.
• removed wine connection after the tests passed.

[codecov-commenter]

Codecov Report

Merging #639 (37698d9) into develop (0669942) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #639   +/-   ##
========================================
  Coverage    62.46%   62.46%           
========================================
  Files          241      241           
  Lines        13398    13398           
  Branches       370      370           
========================================
  Hits          8369     8369           
  Misses        4438     4438           
  Partials       591      591           

Flag	Coverage Δ
go	55.03% <ø> (ø)
python	70.53% <ø> (ø)

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

Impacted Files	Coverage Δ
...s/operator/controllers/modeltraining_controller.go	57.44% <0.00%> (-3.20%)	:arrow_down:
.../operator/controllers/modelpackaging_controller.go	57.71% <0.00%> (+3.42%)	:arrow_up: