Main actions position

Actions do have a position option, but it is not used for the "main" group.

The following template is missing the call to `...|sylius_sort_by('position')`:

https://github.com/Sylius/Stack/blob/main/src/BootstrapAdminUi/templates/shared/crud/common/content/header/title_block/actions.html.twig

We should also verify if the position is used for other action groups.