Issue #88: Clean up dead code

[kmanning]

• Issue Add the ability to destroy environments through the pipeline #88
• There's some dead code that was missed from the last PR

[codecov-commenter]

Codecov Report

Merging #269 into master will increase coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #269      +/-   ##
==========================================
+ Coverage   66.82%   66.98%   +0.16%     
==========================================
  Files          35       35              
  Lines         835      833       -2     
  Branches      218      218              
==========================================
  Hits          558      558              
+ Misses        177      175       -2     
  Partials      100      100              

Impacted Files	Coverage Δ
src/ParameterStoreBuildWrapperPlugin.groovy	40.90% <ø> (+1.77%)	⬆️
src/ParameterStoreExecPlugin.groovy	56.25% <ø> (+3.30%)	⬆️
src/TerraformEnvironmentStage.groovy	91.42% <ø> (ø)

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