test(parser): cover optional SES common headers including replyTo

[LuisFigueroaG]

Issue number: closes #8523

Summary

Changes

Adds a test that parses a full SES event with SesModel and checks that the optional commonHeaders fields cc, bcc, sender and reply_to are populated.

The replyTo alias fix originally in this PR was merged separately in #8542, so this PR now carries only the test, which goes through the full event and covers more fields than the one merged there.

User experience

No runtime change. Better regression coverage for SesMailCommonHeaders.

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[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

[leandrodamascena]

Hi @LuisFigueroaG, I owe you an apology. You reported #8523 and sent this fix three days before #8542, and we ended up reviewing and merging the later one without noticing yours. That was our mistake.

Rather than closing this, I rebased your branch on develop and kept your test, which is more complete than the one we merged since it goes through SesModel with the full event and also covers cc, bcc and sender. The alias change is already in develop, so this PR now carries only the test, still authored by you. Approving so you land as a contributor in this release. Thank you, and sorry again for the mix-up!

[powertools-for-aws-oss-automation]

Referenced issues are closed or don't exist. Please ensure there is an open issue related to this change to avoid significant delays or closure.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.92%. Comparing base (4624628) to head (6c06a42).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8525   +/-   ##
========================================
  Coverage    96.92%   96.92%           
========================================
  Files          317      317           
  Lines        15976    15976           
  Branches      1413     1413           
========================================
  Hits         15484    15484           
  Misses         349      349           
  Partials       143      143           

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