Remove Extensions.getRootArea

[cortinico]

Extensions.getRootArea is deprecated and should be replaced with ComponentManager.getExtensionArea()

Moreover this will potentially address #3844

Fixes #3683

[codecov]

Codecov Report

Merging #3848 (8fddeab) into main (7638573) will decrease coverage by 0.02%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##               main    #3848      +/-   ##
============================================
- Coverage     83.58%   83.56%   -0.03%     
+ Complexity     3110     3108       -2     
============================================
  Files           456      456              
  Lines          8931     8931              
  Branches       1748     1748              
============================================
- Hits           7465     7463       -2     
- Misses          551      552       +1     
- Partials        915      916       +1     

Impacted Files	Coverage Δ
...n/kotlin/io/github/detekt/parser/DetektPomModel.kt	58.82% <50.00%> (-11.77%)	⬇️

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[chao2zhang]

Thank you for doing this. I was about to take a look yesterday but I am glad that this is addressed already