[PE-103] Update group action to use created_at as a reserved key

[tcgilbert]

Currently, our Mixpanel group action only treats the name trait field as a reserved property for Mixpanel.

• Reserved Properties in Mixpanel

A customer has raised a concern that they would like the created field to be handled in the same way as name. As currently, when createdAt, created, or created_at are not sent as $created, these fields are added to group profiles as regular profile properties instead of being treated as reserved properties.

The ask from the customer is to update the group action to operate in the same way that the identify action does regarding reserved properties. Similar to this update: #801

Testing

• ✅ Added unit tests for new functionality
• ✅ Tested end-to-end using the local server

before update

after update

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.97%. Comparing base (16ec611) to head (45f25dc).
Report is 20 commits behind head on main.

Additional details and impacted files

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  Coverage   77.97%   77.97%           
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  Files         991      991           
  Lines       17327    17328    +1     
  Branches     3265     3266    +1     
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+ Hits        13510    13511    +1     
  Misses       2729     2729           
  Partials     1088     1088           

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[joe-ayoub-segment]

hi @tcgilbert thanks for doing this.
I see no issues with it as it replicates a pre-existing pattern from the identify() Action, and you showed that it tested successfully.

[joe-ayoub-segment]

hi @tcgilbert this PR has been deployed. Please confirm you are happy with the change!