As some event models (event.type and event.ticket notably) are about to
be modified let us add some tests to avoid regressions.
Security tests are also moved in their own file. Some internals tests defined
in event_sale are also moved in their own file. That way we avoid bloating
files with unrelated tests. Future commits will add tests for event and
event.type models.
LINKS
Task ID 2177281 (support tickets directly in event)
Prepares Community PR odoo/odoo#43488
Closes Community PR odoo/odoo#44066