Fix message limit with SQS

[obenkenobi]

Overview

Fixes an issue where customers using over 7 message attributes with SQS and are using CAT headers are having their message limits exceeded. This change makes it so you can only have DT headers if the number of attributes is at max 7.

Supportability metrics are also added to capture when messages fail to send

Related Github Issue

#2419

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.50%. Comparing base (a5d1ef4) to head (324ef85).
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2422      +/-   ##
============================================
- Coverage     70.50%   70.50%   -0.01%     
+ Complexity    10043    10042       -1     
============================================
  Files           845      845              
  Lines         40693    40693              
  Branches       6171     6171              
============================================
- Hits          28692    28689       -3     
- Misses         9211     9212       +1     
- Partials       2790     2792       +2     

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[kanderson250]

Looks great, thanks!