fix(op): return state in token response only for implicit flow

[muhlemmer]

Return state as part of the token response only for implicit flow. For code flow the state should not be returned as part of the token response.

Closes #446

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
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• All non-functional requirements are met
• Functionality of the acceptance criteria is checked manually on the dev system.

[codecov]

Codecov Report

Merging #460 (76b36cf) into main (976b406) will decrease coverage by 0.04%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #460      +/-   ##
==========================================
- Coverage   60.33%   60.30%   -0.04%     
==========================================
  Files          78       78              
  Lines        6696     6698       +2     
==========================================
- Hits         4040     4039       -1     
- Misses       2367     2369       +2     
- Partials      289      290       +1     

Files	Coverage Δ
pkg/op/token.go	68.57% <0.00%> (-1.38%)	⬇️

[github-actions]

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