Sub-modules will need to add new values before rendering the registration
template. This will be used to be able to display more information in those
modules, e.g. a toast message when being redirected to register.
For that purpose we create a method to prepare those values and separate
value creation from template rendering itself.
LINKS
PR #55260
Task ID-2310491 (Event Online Preparation 5)
Part of Task ID-2252655 (Main Online Event task)
Part of Task ID-2283796 (Event B2Basics / Registration Flow)
std-odoo
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