fix: don't require session for OIDC verification

[hperl]

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

Merging #3443 (57a16d5) into master (2f5ba1f) will increase coverage by 0.04%.
Report is 1 commits behind head on master.
The diff coverage is 73.07%.

❗ Current head 57a16d5 differs from pull request most recent head 3cd81a9. Consider uploading reports for the commit 3cd81a9 to get more accurate results

@@            Coverage Diff             @@
##           master    #3443      +/-   ##
==========================================
+ Coverage   78.00%   78.04%   +0.04%     
==========================================
  Files         326      327       +1     
  Lines       21570    21594      +24     
==========================================
+ Hits        16826    16854      +28     
+ Misses       3488     3482       -6     
- Partials     1256     1258       +2     

Files Changed	Coverage Δ
selfservice/flow/flow.go	100.00% <ø> (ø)
selfservice/strategy/code/strategy_recovery.go	70.56% <0.00%> (ø)
selfservice/strategy/link/strategy_recovery.go	63.33% <0.00%> (ø)
selfservice/flow/verification/fake_strategy.go	40.00% <40.00%> (ø)
driver/registry_default.go	86.68% <60.00%> (-0.34%)	⬇️
selfservice/flow/verification/handler.go	66.20% <90.00%> (+11.05%)	⬆️
driver/registry_default_verification.go	92.00% <100.00%> (ø)
selfservice/flow/registration/flow.go	97.36% <100.00%> (-0.07%)	⬇️
selfservice/flow/verification/flow.go	92.00% <100.00%> (ø)
selfservice/hook/verification.go	77.77% <100.00%> (+1.03%)	⬆️

[zepatrik]

Nice, I just have some questions on edge cases 👍

[zepatrik]

Now just some test failures...