[DOP-24163] add more verbose error message

[TiGrib]

Change Summary

More verbose error message from keycloak

Related issue number

[DOP-24163]

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.88%. Comparing base (a30544f) to head (fa82d9b).
Report is 110 commits behind head on develop.

Files with missing lines	Patch %	Lines
...rentgen/server/providers/auth/keycloak_provider.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #191      +/-   ##
===========================================
- Coverage    91.90%   91.88%   -0.02%     
===========================================
  Files          197      197              
  Lines         4892     4893       +1     
  Branches       342      342              
===========================================
  Hits          4496     4496              
- Misses         327      328       +1     
  Partials        69       69              

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