Cleanup MayBeConst tests

[cortinico]

Since we touched MayBeConst in #2799, let's cleanup the tests a bit:

• Removed old resource file
• Switched all the lint to compileAndLint
• Fixed several compilation failures we had
• Adding asserts on SourceLocations

[codecov]

Codecov Report

Merging #2802 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2802      +/-   ##
============================================
- Coverage     80.53%   80.52%   -0.02%     
+ Complexity     2326     2323       -3     
============================================
  Files           386      386              
  Lines          6957     6957              
  Branches       1262     1262              
============================================
- Hits           5603     5602       -1     
- Misses          725      726       +1     
  Partials        629      629              

Impacted Files	Coverage Δ	Complexity Δ
...gitlab/arturbosch/detekt/rules/style/MayBeConst.kt	78.00% <0.00%> (-2.00%)	39.00% <0.00%> (-3.00%)

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[schalkms]

Thanks for doing this tedious work!