chore: upgrade to openapi generator 7.11

[edgarvonk]

Upgraded to openapi generator version 7.11. One of our issues was fixed in this version but we got two new issues back for which I added workarounds.. It looks like both are caused by the new support for JSON-B polymorphism type annotations introduced by OpenAPITools/openapi-generator#20164:

Solves PZ-5160

[github-actions]

unit-test-results

 79 files  ±0  109 suites  ±0   2m 4s ⏱️ -6s
378 tests ±0  377 ✅ ±0  1 💤 ±0  0 ❌ ±0 
472 runs  ±0  470 ✅ ±0  2 💤 ±0  0 ❌ ±0 

Results for commit eb3a0c3. ± Comparison against base commit 891cd86.

[github-actions]

integration-test-results

 28 files  ±0   28 suites  ±0   35s ⏱️ ±0s
107 tests ±0  107 ✅ ±0  0 💤 ±0  0 ❌ ±0 
120 runs  ±0  120 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit eb3a0c3. ± Comparison against base commit 891cd86.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.62%. Comparing base (916165b) to head (eb3a0c3).
Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##               main    #2517    +/-   ##
==========================================
  Coverage     54.62%   54.62%            
  Complexity     3360     3360            
==========================================
  Files          1000     1000            
  Lines         22746    22746            
  Branches       1750     1777    +27     
==========================================
  Hits          12426    12426            
+ Misses         9525     9406   -119     
- Partials        795      914   +119     

Flag	Coverage Δ
integrationtests	50.00% <100.00%> (ø)
unittests	34.69% <100.00%> (ø)

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