feature(#1266): zammad file attachments

[lmoesle]

Description

Allow users to attach files to zammad tickets

Reference

Issues: closes #1266

Check-List

• All Acceptance criteria of user story are met
• Accessibility was considered and tested (On UI Change)
• JUnit tests are written (60% CodeCov)
• Internal Review is maintained
• Documentations external and internal are completed
• Smoketest successful (Manual E2E-Test depending on Change)
• No waste on Branch left (e.g. console.logs)
• Board is up-to-date

[codecov]

Codecov Report

Attention: Patch coverage is 80.32787% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 42.80%. Comparing base (48f7195) to head (ba3d143).
Report is 5 commits behind head on dev.

❗ Current head ba3d143 differs from pull request most recent head de4506c. Consider uploading reports for the commit de4506c to get more accurate results

Files	Patch %	Lines
...f/ticket/integration/adapter/out/s3/S3Adapter.java	72.22%	9 Missing and 1 partial ⚠️
...t/integration/application/WriteArticleUseCase.java	80.00%	0 Missing and 1 partial ⚠️
...f/ticket/integration/domain/model/FileContent.java	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #1389      +/-   ##
============================================
+ Coverage     42.37%   42.80%   +0.43%     
- Complexity     1546     1585      +39     
============================================
  Files           632      640       +8     
  Lines          9181     9303     +122     
  Branches        452      452              
============================================
+ Hits           3890     3982      +92     
- Misses         5136     5160      +24     
- Partials        155      161       +6     

Flag	Coverage Δ
unittests	42.80% <80.32%> (+0.43%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.