Always dispose Kotlin environment fixing memory leak in error cases

[arturbosch]

No description provided.

[codecov-io]

Codecov Report

Merging #2276 into master will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #2276   +/-   ##
=========================================
  Coverage     81.65%   81.65%           
+ Complexity     2110     2109    -1     
=========================================
  Files           348      348           
  Lines          6033     6033           
  Branches       1105     1105           
=========================================
  Hits           4926     4926           
  Misses          518      518           
  Partials        589      589

Impacted Files	Coverage Δ	Complexity Δ
.../io/gitlab/arturbosch/detekt/cli/runners/Runner.kt	87.5% <ø> (-0.22%)	15 <0> (ø)
...itlab/arturbosch/detekt/core/ProcessingSettings.kt	90% <100%> (+0.16%)	18 <0> (-1)	⬇️
.../arturbosch/detekt/cli/runners/SingleRuleRunner.kt	86.11% <100%> (ø)	6 <0> (ø)	⬇️

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