Improve generator test coverage

[marschwar]

This extends the generator tests to cover

• rule set configuration parameters
• list properties in rules

[codecov]

Codecov Report

Merging #3622 (c25f8a9) into main (36edd4c) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##               main    #3622      +/-   ##
============================================
+ Coverage     78.22%   78.23%   +0.01%     
  Complexity     2826     2826              
============================================
  Files           466      466              
  Lines          9136     9136              
  Branches       1724     1724              
============================================
+ Hits           7147     7148       +1     
+ Misses         1059     1057       -2     
- Partials        930      931       +1     

Impacted Files	Coverage Δ	Complexity Δ
...gitlab/arturbosch/detekt/generator/out/Markdown.kt	21.42% <0.00%> (ø)	4.00 <0.00> (ø)
...ekt/generator/printer/rulesetpage/ConfigPrinter.kt	77.08% <0.00%> (+2.08%)	9.00% <0.00%> (ø%)

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