feat(core): add failure message to uncompleted test result

[Malinskiy]

Due to recent updates also includes fixes for mockito-kotlin

Closes #853

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (723bd40) 59.37% compared to head (a989e03) 59.34%.

❗ Current head a989e03 differs from pull request most recent head c9550da. Consider uploading reports for the commit c9550da to get more accurate results

Files	Patch %	Lines
...onfig/serialization/MutableConfigurationFactory.kt	0.00%	1 Missing ⚠️
...thon/execution/result/TestRunResultsAccumulator.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #859      +/-   ##
=============================================
- Coverage      59.37%   59.34%   -0.03%     
+ Complexity       798      797       -1     
=============================================
  Files            214      214              
  Lines           4413     4410       -3     
  Branches         702      703       +1     
=============================================
- Hits            2620     2617       -3     
  Misses          1466     1466              
  Partials         327      327              

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