feat: remove response.upserted webhook event

[jfcalvo]

Description

As discussed we want to stop using response.upserted webhook event and instead use response.created or response.updated when a response is upserted.

Refs #1836

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested

• Running test suite.

Checklist

• I added relevant documentation
• I followed the style guidelines of this project
• I did a self-review of my code
• I made corresponding changes to the documentation
• I confirm My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (feat/add-webhooks-feature-branch@3fb3d66). Learn more about missing BASE report.

Additional details and impacted files

@@                         Coverage Diff                         @@
##             feat/add-webhooks-feature-branch    #5494   +/-   ##
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  Coverage                                    ?   91.40%           
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  Files                                       ?      157           
  Lines                                       ?     6321           
  Branches                                    ?        0           
===================================================================
  Hits                                        ?     5778           
  Misses                                      ?      543           
  Partials                                    ?        0           

Flag	Coverage Δ
argilla-server	91.40% <100.00%> (?)

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