ref(deletions): Remove unnecessary calls in endpoint

[armenzg]

During the API call we were doing work that the Group model already does.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:white_check_mark: All tests successful. No failed tests found.

Additional details and impacted files

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##           master   #93541      +/-   ##
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- Coverage   87.83%   87.81%   -0.02%     
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  Files       10478    10492      +14     
  Lines      605960   606303     +343     
  Branches    23674    23674              
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+ Hits       532216   532403     +187     
- Misses      73380    73536     +156     
  Partials      364      364              

[armenzg]

Bug: Group Deletion Logic Inconsistency

The GroupHash deletion was removed from the delete_group_list API endpoint, despite PR discussion acknowledging the need to restore it. This allows new events to associate with groups marked as PENDING_DELETION during the window before the asynchronous deletion task completes. This contradicts the original intent to prevent such associations and is inconsistent with the retained GroupInbox deletion logic.

src/sentry/api/helpers/group_index/delete.py#L78-L84 Fix in Cursor • Fix in Web

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We don't want to delete GroupHash since it will be needed during the task execution to call Seer.