fix: re-use existing CSRF token in verification flows

[jonas-jonas]

Related issue(s)

Fixes ory-corp/cloud/issues/4283

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
  security@ory.sh) 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 #3188 (29e7c9c) into master (590269f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 29e7c9c differs from pull request most recent head f97eda0. Consider uploading reports for the commit f97eda0 to get more accurate results

@@           Coverage Diff           @@
##           master    #3188   +/-   ##
=======================================
  Coverage   77.68%   77.68%           
=======================================
  Files         319      319           
  Lines       20159    20162    +3     
=======================================
+ Hits        15660    15663    +3     
- Misses       3300     3301    +1     
+ Partials     1199     1198    -1     

Impacted Files	Coverage Δ
selfservice/hook/verification.go	75.60% <100.00%> (+1.92%)	⬆️

... and 1 file with indirect coverage changes

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[hperl]

LGTM! 🎉