Simplify YamlConfig

[BraisGabin]

YamlConfig.loadResource(URL) is not needed as method. We can use YamlConfig.load(Reader) and convert the URLs to readers when calling.

This is part of the refactor to implement #4315

[codecov]

Codecov Report

Merging #4316 (0fabcf1) into main (7b8d273) will decrease coverage by 0.01%.
The diff coverage is 70.00%.

@@             Coverage Diff              @@
##               main    #4316      +/-   ##
============================================
- Coverage     84.22%   84.20%   -0.02%     
  Complexity     3258     3258              
============================================
  Files           472      473       +1     
  Lines         10309    10309              
  Branches       1820     1821       +1     
============================================
- Hits           8683     8681       -2     
  Misses          666      666              
- Partials        960      962       +2     

Impacted Files	Coverage Δ
...gitlab/arturbosch/detekt/core/config/YamlConfig.kt	85.71% <ø> (+0.86%)	⬆️
...lin/io/github/detekt/tooling/internal/Resources.kt	50.00% <50.00%> (ø)
...lab/arturbosch/detekt/core/config/DefaultConfig.kt	66.66% <66.66%> (-33.34%)	⬇️
...ab/arturbosch/detekt/core/config/Configurations.kt	84.37% <100.00%> (ø)
...bosch/detekt/core/tooling/DefaultConfigProvider.kt	80.00% <100.00%> (ø)

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