Clean up CodePipeline Job Implementation

[whithajess]

• Incorrectly used "CodePipelineEvent"

Makes the change from #245 in a non breaking fashion.

Issue #, if available:

#244

Description of changes:

Moves CodePipelineJob into its own CodePipelineJobEvent giving back the CodePipelineEvent namespace for actual usage.

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[codecov-commenter]

Codecov Report

Merging #382 (27541ec) into master (99b35f2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #382   +/-   ##
=======================================
  Coverage   72.22%   72.22%           
=======================================
  Files          19       19           
  Lines         738      738           
=======================================
  Hits          533      533           
  Misses        138      138           
  Partials       67       67           

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