fix(event_handler): support finding type annotated resolver when merging schemas

[siwyd]

Issue number: closes #8073

Summary

Changes

Support type annotated resolver finding for OpenAPI merge.

User experience

Type annotated resolver was simply not found, now it is.

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[boring-cyborg]

Thanks a lot for your first contribution! Please check out our contributing guidelines and don't hesitate to ask whatever you need.
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[siwyd]

@anafalcao Hi! I changed the PR title to try and pass the Semantic PR check, but it doesn't seem like it retriggers automatically? Can I trigger it myself somehow again?

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 96.65%. Comparing base (3f6fc29) to head (6a94d20).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...s_lambda_powertools/event_handler/openapi/merge.py	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8074   +/-   ##
========================================
  Coverage    96.64%   96.65%           
========================================
  Files          282      282           
  Lines        13791    13798    +7     
  Branches      1102     1103    +1     
========================================
+ Hits         13329    13336    +7     
  Misses         339      339           
  Partials       123      123           

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[leandrodamascena]

Thanks for fixing this @siwyd! I missed this when building this new feature.

I moved the test from unit to functional and added a new handler to test this. While your unit test was good, I prefer to have this as a function test and test the functionally working with a real Lambda.

APPROVED! Thanks a lot.

[boring-cyborg]

Awesome work, congrats on your first merged pull request and thank you for helping improve everyone's experience!