feat: use one transaction for /admin/recovery/code

[aeneasr]

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 61.11111% with 7 lines in your changes missing coverage. Please review.

Project coverage is 78.56%. Comparing base (e6d2d4d) to head (c632393).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
...lfservice/strategy/code/strategy_recovery_admin.go	69.23%	2 Missing and 2 partials ⚠️
selfservice/strategy/link/strategy_recovery.go	40.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4225      +/-   ##
==========================================
+ Coverage   78.52%   78.56%   +0.04%     
==========================================
  Files         380      380              
  Lines       27231    27235       +4     
==========================================
+ Hits        21383    21398      +15     
+ Misses       4224     4217       -7     
+ Partials     1624     1620       -4     

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