Use diktat-runner:shadow as variant

[nulls]

What's done:

• shadow jar as variant is due to Gradle multiply artifacts issue

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e51bcf6) 78.33% compared to head (a59f6f3) 78.32%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1875      +/-   ##
============================================
- Coverage     78.33%   78.32%   -0.02%     
  Complexity     2458     2458              
============================================
  Files           134      134              
  Lines          8696     8696              
  Branches       2201     2201              
============================================
- Hits           6812     6811       -1     
- Misses          905      906       +1     
  Partials        979      979              

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[github-actions]

JUnit Tests (macOS, EnricoMi/publish-unit-test-result-action@v2)

   166 files  ±0     166 suites  ±0   6m 15s ⏱️ + 2m 7s
1 426 tests ±0  1 388 ✔️ ±0  38 💤 ±0  0 ❌ ±0 
2 805 runs  ±0  2 767 ✔️ ±0  38 💤 ±0  0 ❌ ±0 

Results for commit c9d56b0. ± Comparison against base commit e51bcf6.

[github-actions]

JUnit Tests (Windows, EnricoMi/publish-unit-test-result-action@v2)

   166 files  ±0     166 suites  ±0   7m 29s ⏱️ -3s
1 426 tests ±0  1 409 ✔️ ±0  17 💤 ±0  0 ❌ ±0 
2 805 runs  ±0  2 788 ✔️ ±0  17 💤 ±0  0 ❌ ±0 

Results for commit c9d56b0. ± Comparison against base commit e51bcf6.