Purpose of this commit is to add performance tests for some commonly used
URLs related to event: the main event page and browsing a given event.
A complete registration tour involving buying tickets, answering questions
and filling billing information is also added under a query counter check.
This allows to see a bit how many queries are involved in that flow. To
ease reproduction a data is added but not imported, allowing to quickly see
what happens locally instead of having to debug tests.
Task-2703285 (Event performance improvements)
Task-2703289 (Event testing and coverage)
Part-of: odoo/odoo#81068
Thibault Delavallée
2411a6b69c