T-39: add additional sink for reports

[whiskels]

Resolves #219

[codecov]

Codecov Report

Attention: Patch coverage is 60.49383% with 32 lines in your changes missing coverage. Please review.

Project coverage is 87.22%. Comparing base (7d21664) to head (b2c785b).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...astructure/report/webhook/WebhookSinkExecutor.java	0.00%	16 Missing ⚠️
...nfrastructure/report/slack/SlackPayloadMapper.java	0.00%	13 Missing ⚠️
...frastructure/report/slack/SlackReportExecutor.java	66.66%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #220      +/-   ##
============================================
- Coverage     91.07%   87.22%   -3.86%     
- Complexity      266      267       +1     
============================================
  Files            61       63       +2     
  Lines           717      759      +42     
  Branches         34       37       +3     
============================================
+ Hits            653      662       +9     
- Misses           50       82      +32     
- Partials         14       15       +1     

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