Added Deleted field to support codecommit ref delete events

[praveenk007]

Issue #, if available:
#528

Description of changes:
Added Deleted field so that the consumer is able to identify reference delete events.

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[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (2ff7818) 72.63% compared to head (0a79053) 72.63%.

❗ Current head 0a79053 differs from pull request most recent head 06e65fe. Consider uploading reports for the commit 06e65fe to get more accurate results

Files	Patch %	Lines
events/code_commit.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #531   +/-   ##
=======================================
  Coverage   72.63%   72.63%           
=======================================
  Files          26       26           
  Lines        1407     1407           
=======================================
  Hits         1022     1022           
  Misses        314      314           
  Partials       71       71           

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[leepa]

You've committed your .idea folder. You'll want to remove that.

[bmoffatt]

Wasn't able to find quickly a docs reference, so had to run a quick test by hand to verify

{'Records': [{'awsRegion': 'us-west-2', 'codecommit': {'references': [{'commit': '023f0e4effa8955bd8dbae4f104b74206cf74252', 'deleted': True, 'ref': 'refs/heads/yoho'}]}, ...

LGTM! Thanks!