Feat/reservation question

[RomainLvr]

Checklist before requesting a review

Please delete options that are not relevant.

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

• It fixes !39540
• Here is a brief description of what this PR does

Adds a material reservation capability to AdvancedForms: end users can reserve equipment directly from a GLPI form. The answer creates a ticket-driven reservation request that can be validated from the ticket timeline, and the actual reservation is created in the GLPI planning once approved (or immediately, in direct mode).

Features

• New question type "Material reservation" equipment dropdown (grouped by type, loaded via AJAX and filtered by the allowed types configured on the question) plus start/end date pickers with real-time availability check and a list of the item's existing reservations.
• New destination field "Pre-reservation" on the Ticket destination, maps a reservation question to a reservation request, with a "Require technician approval" toggle:
  • Approval mode (default): the request appears in the ticket timeline as pending, with Approve / Refuse actions; the reservation is created on approval.
  • Direct mode: if the slot is still free at submission, the reservation is created and confirmed automatically; if it was taken meanwhile, the request is canceled and the requester is notified.
• Ticket timeline integration each request is shown in the timeline (equipment, time slot, status) with inline approve/refuse handling.
• Notifications requester is notified on creation, approval, refusal and slot-unavailable events; template and notifications are set up at install.
• Reservation traceability an approved request is linked to its reservation, and deleting the request cleans up the reservation.

Screenshots (if appropriate):

• Question configuration "Material reservation" question type in the form editor (allowed equipment types)

• End-user widget equipment selection, date pickers, availability check and existing reservations

• Destination config "Pre-reservation" field with the "Require technician approval" toggle

• Ticket timeline (approval mode) pending request with Approve / Refuse buttons

• Ticket timeline (direct mode) automatically confirmed reservation