Event creation conflicts: endpoint body is ignored instead of returned

[ferishili]

Description:
When creating events and a conflict occurs, the endpoint returns the list of conflicted events in the response body.
Currently, this body is ignored during error handling, which makes it impossible for clients to access details about which events caused the conflict.

Expected behavior:
The response body should be included and returned to the client, even in case of errors, so that the conflicted events can be processed or displayed.

Current behavior:
The response body is ignored during errors.