SESv2: include default DKIM metadata in create_email_identity response

[SergioChan]

Summary

• include default SigningAttributesOrigin and NextSigningKeyLength in SESv2 DKIM attributes when create_email_identity is called without custom DKIM signing attributes
• align the create response with the DKIM metadata expected for issue SESv2: CreateEmailIdentity should include extra DkimAttributes #9771
• add assertions in test_create_email_identity to lock the default DKIM fields in place

Testing

• python -m pytest tests/test_sesv2/test_sesv2.py -k test_create_email_identity

Related

• Fixes SESv2: CreateEmailIdentity should include extra DkimAttributes #9771

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.12%. Comparing base (4e435f4) to head (17dc4d4).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9844   +/-   ##
=======================================
  Coverage   93.12%   93.12%           
=======================================
  Files        1308     1308           
  Lines      118885   118887    +2     
=======================================
+ Hits       110707   110709    +2     
  Misses       8178     8178           

Flag	Coverage Δ
servertests	28.89% <0.00%> (-0.01%)	⬇️
unittests	93.09% <100.00%> (+<0.01%)	⬆️

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