Not all things are managed by TouristMarketingCompany, some are managed
by generic organisations.
Those are now handled the same way as TouristMarketingCompany are
already handled.
That way those things can also be imported, as they now can import their
manager.
This is deprecated in newer PHP versions, one should use native
str_ends_with() instead.
We remove the deprecation by using this function. But we also support
older PHP versions, so we add symfony/polyfill-php80 as dependency to
always ensure this function exists.
