TicketValidation pre_item_form hook

[keboeoris]

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• I have read the CONTRIBUTING document.
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Description

If we want to use the pre_item_form hook for a validation request, GLPI does not pass the subitem to the Twig template during the timeline rendering.
If the subitem is not passed, the item is empty in the hook, making it impossible to use the data.

Solution: Add the subitem to the include of the item type template.

Screenshots (if appropriate):

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