fix: only create request if it does not exist

[stephhuynh18]

problem: we used to merge on conflict when creating requests. This can result in multiple messages set to the scheduler, and misleading log messages

fix: ignore on conflict

added unit tests

[linear]

WS2-3147 Don't send duplicate SQS messages from CAS API

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.66667% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 81.29%. Comparing base (14771a4) to head (0b745f7).

Files	Patch %	Lines
src/controllers/request-controller.ts	88.88%	1 Missing ⚠️
src/services/__tests__/fake-factory.util.ts	66.66%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1190      +/-   ##
===========================================
- Coverage    81.30%   81.29%   -0.02%     
===========================================
  Files           46       46              
  Lines         1819     1828       +9     
  Branches       285      289       +4     
===========================================
+ Hits          1479     1486       +7     
- Misses         340      342       +2     

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[stbrody]

LGTM!