hotfix(#1114): switch to camunda rest client feign

[lmoesle]

Description

Short description or comments

Reference

Issues: closes #1114

Check-List

• All Acceptance criteria of user story are met
• 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 Branch waste left
• Board is up-to-date
• Openshift environments are prepared (Secrets, etc.) and release-issue is maintained

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (4f6bd44) 37.66% compared to head (a8688db) 37.72%.

Files	Patch %	Lines
...en/oss/digiwf/connector/CamundaSecurityConfig.java	0.00%	4 Missing ⚠️
...amunda/connector/incident/IncidentServiceImpl.java	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@                     Coverage Diff                     @@
##             release/2023-december    #1117      +/-   ##
===========================================================
+ Coverage                    37.66%   37.72%   +0.06%     
  Complexity                    1258     1258              
===========================================================
  Files                          600      600              
  Lines                         8698     8681      -17     
  Branches                       422      423       +1     
===========================================================
- Hits                          3276     3275       -1     
+ Misses                        5289     5272      -17     
- Partials                       133      134       +1     

Flag	Coverage Δ
unittests	37.72% <45.45%> (+0.06%)	⬆️

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