Fix test failures from error response improvements

[tharikaGitHub]

This PR fixes the test failures from wso2/carbon-apimgt#12570

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[tharikaGitHub]

The test failure in Group 1 is a known intermittent test failure.

Results:
2024-09-21T11:45:16.1969750Z [INFO] 
2024-09-21T11:45:16.1970149Z [ERROR] Failures: 
2024-09-21T11:45:16.1971958Z [ERROR]   APIInvocationWithMessageTypeProperty.testInovkeAPIWithMessageTypePropertyInSequence:67 » NullPointer
2024-09-21T11:45:16.1972914Z [INFO] 
2024-09-21T11:45:16.1973340Z [ERROR] Tests run: 570, Failures: 1, Errors: 0, Skipped: 0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 11.83%. Comparing base (ebcdd27) to head (dc4a9c2).
Report is 10 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13535      +/-   ##
============================================
- Coverage     17.80%   11.83%   -5.98%     
+ Complexity      894      602     -292     
============================================
  Files           255      255              
  Lines         11551    11551              
  Branches       1204     1204              
============================================
- Hits           2057     1367     -690     
- Misses         9477    10167     +690     
  Partials         17       17              

Flag	Coverage Δ
integration_tests	11.83% <ø> (-5.98%)	⬇️

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[tharikaGitHub]

Can merge as the second run of Group 1 test cases are successful.