fix: improve migration status speed

[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 green light (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

[github-actions]

Codeball: LGTM! 👍

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dashboard

[codecov]

Codecov Report

Merging #2637 (22e20fc) into master (4ce9f1e) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2637      +/-   ##
==========================================
+ Coverage   75.20%   75.27%   +0.06%     
==========================================
  Files         295      295              
  Lines       16630    16630              
==========================================
+ Hits        12507    12518      +11     
+ Misses       3166     3158       -8     
+ Partials      957      954       -3     

Impacted Files	Coverage Δ
persistence/sql/persister_courier.go	86.76% <0.00%> (-2.95%)	⬇️
courier/courier_dispatcher.go	56.86% <0.00%> (+3.92%)	⬆️
courier/smtp.go	75.00% <0.00%> (+9.16%)	⬆️

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