feat(oidc): return defined error when discovery failed

[ay4toh5i]

This PR adds a specific error to handle discovery failures.
It allows proper error handling when the issuer URL is invalid or the configuration is missing.
Thank you.

Definition of Ready

• I am happy with the code
• Short description of the feature/issue is added in the pr description
• PR is linked to the corresponding user story
• Acceptance criteria are met
• All open todos and follow ups are defined in a new ticket and justified
• Deviations from the acceptance criteria and design are agreed with the PO and documented.
• No debug or dead code
• My code has no repetitions
• Critical parts are tested automatically
• Where possible E2E tests are implemented
• Documentation/examples are up-to-date
• All non-functional requirements are met
• Functionality of the acceptance criteria is checked manually on the dev system.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.09%. Comparing base (0992c5f) to head (9af7d5e).
Report is 93 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #653      +/-   ##
==========================================
+ Coverage   60.06%   62.09%   +2.03%     
==========================================
  Files          80       81       +1     
  Lines        6998     6218     -780     
==========================================
- Hits         4203     3861     -342     
+ Misses       2498     2047     -451     
- Partials      297      310      +13     

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[ay4toh5i]

@muhlemmer
Thanks for taking the time to review my PR and for the feedback!
I’ve addressed the points you mentioned. Could you take another look when you get a chance?

[github-actions]

🎉 This PR is included in version 3.30.0 🎉

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