This update expands how SLAs are defined for helpdesk tickets, allowing other Odoo modules to customize the criteria used to match SLAs. Previously, this was limited, but now it's enabled, providing greater flexibility and control over SLA management within the Helpdesk module. This improves the ability to tailor SLAs to specific business needs.

Allow other modules to modify the _sla_find domain when adding SLAs to helpdesk tickets.

This is already the case for extra and false domains, while the main domain is hardcoded up to this commit.