fix: accept login challenge in session_issuer on SPA flows

[jonas-jonas]

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

Attention: Patch coverage is 76.47059% with 8 lines in your changes missing coverage. Please review.

Project coverage is 78.59%. Comparing base (119841a) to head (392010b).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
selfservice/flow/continue_with.go	60.00%	4 Missing ⚠️
selfservice/hook/session_issuer.go	83.33%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4288   +/-   ##
=======================================
  Coverage   78.58%   78.59%           
=======================================
  Files         381      381           
  Lines       27370    27404   +34     
=======================================
+ Hits        21509    21537   +28     
- Misses       4238     4243    +5     
- Partials     1623     1624    +1     

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