Feature/#769 refarch refactoring

[lehju]

Description

Update graceful shutdown probes and remove old code.
Add error mapping config map to 500.

Reference

Issues: closes #769

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: 2 lines in your changes are missing coverage. Please review.

Comparison is base (6801334) 38.52% compared to head (1a69043) 38.88%.
Report is 3 commits behind head on dev.

Files	Patch %	Lines
...ateway/filter/GlobalAuthenticationErrorFilter.java	95.00%	0 Missing and 1 partial ⚠️
...wf/gateway/filter/GlobalBackend5xxTo400Mapper.java	96.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #1207      +/-   ##
============================================
+ Coverage     38.52%   38.88%   +0.36%     
+ Complexity     1310     1308       -2     
============================================
  Files           599      595       -4     
  Lines          8678     8659      -19     
  Branches        424      424              
============================================
+ Hits           3343     3367      +24     
+ Misses         5197     5153      -44     
- Partials        138      139       +1     

Flag	Coverage Δ
unittests	38.88% <96.15%> (+0.36%)	⬆️

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