fix(core/tests): fix core unit tests

[vgonkivs]

Fixed test by manually creating tesnode.Network to have a control over testnode.Context lifecycle

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 35.50%. Comparing base (2469e7a) to head (b2443cd). Report is 517 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4366      +/-   ##
==========================================
- Coverage   44.83%   35.50%   -9.34%     
==========================================
  Files         265      323      +58     
  Lines       14620    25195   +10575     
==========================================
+ Hits         6555     8945    +2390     
- Misses       7313    15282    +7969     
- Partials      752      968     +216     

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[vgonkivs]

the tests are still broken. Moving to draft to investigate the issue