fix(exampleop): pass the issuer interceptor to login

[muhlemmer]

Use the IssuerInterceptor in the exampleop package, so that the issuer is correctly set to the context. Withouth the interceptor, AuthCallbackURL would return only relative paths. This breaks users addapting the example with a custom issuer prefix.

Notes:

1. Prefix handling worked find for all the op handlers. It was just the login in exampleop that failed to set the issuer to the context correctly.
2. The dynamic example was also correct with the IssuerInterceptor.

Testing was done manually and then rolled back. See commit ee72eb0.

Closes #408

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 aret 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
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• Critical parts are tested automatically
• Where possible E2E tests are implemented
• Documentation/examples are up-to-date
• All non-functional requirements are met
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[codecov]

Codecov Report

Merging #430 (ee72eb0) into main (37b5de0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #430   +/-   ##
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  Coverage   53.31%   53.31%           
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  Files          74       74           
  Lines        5725     5725           
=======================================
  Hits         3052     3052           
  Misses       2414     2414           
  Partials      259      259           

[github-actions]

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