EmptyDefaultConstructor false positive with expect and actual classes

[BraisGabin]

Fix #3929

The actual fix is just the last commit. But I did a bit of cleanup in the tests of this rule first.

[codecov]

Codecov Report

Merging #3970 (7f9a6d5) into main (ce7bb32) will increase coverage by 0.01%.
The diff coverage is 66.66%.

❗ Current head 7f9a6d5 differs from pull request most recent head b6b3c66. Consider uploading reports for the commit b6b3c66 to get more accurate results

@@             Coverage Diff              @@
##               main    #3970      +/-   ##
============================================
+ Coverage     83.48%   83.49%   +0.01%     
- Complexity     3159     3160       +1     
============================================
  Files           458      458              
  Lines          9047     9047              
  Branches       1759     1759              
============================================
+ Hits           7553     7554       +1     
- Misses          567      568       +1     
+ Partials        927      925       -2     

Impacted Files	Coverage Δ
...osch/detekt/rules/empty/EmptyDefaultConstructor.kt	80.00% <50.00%> (ø)
...b/arturbosch/detekt/rules/naming/FunctionNaming.kt	100.00% <100.00%> (+3.84%)	⬆️

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[picklebento]

Thank you for the clean up!