fix: correctly apply patches to identity metadata

[jonas-jonas]

Related issue(s)

Fixes #2950

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
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  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

[jonas-jonas]

Moved a few tests around, as they weren't in the right sub-test anyway. Probably best to review without whitespace changes.

[codecov]

Codecov Report

Merging #3103 (b76a5f4) into master (1a5ead4) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head b76a5f4 differs from pull request most recent head 6372639. Consider uploading reports for the commit 6372639 to get more accurate results

@@           Coverage Diff           @@
##           master    #3103   +/-   ##
=======================================
  Coverage   77.42%   77.43%           
=======================================
  Files         315      315           
  Lines       19844    19858   +14     
=======================================
+ Hits        15365    15377   +12     
- Misses       3289     3291    +2     
  Partials     1190     1190           

Impacted Files	Coverage Δ
identity/handler.go	85.47% <100.00%> (+0.89%)	⬆️
courier/message.go	71.73% <0.00%> (-2.18%)	⬇️

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