This opts in to the updated form of `GlSorting` to use
a `GlCollapsibleListbox` rather than the deprecated `GlDropdown`.

Most of the feature spec changes fix actions/finders for interacting
with the sort dropdown. The selectors are now more semantic.

The `Features::SortingHelper#pajamas_sort_by` method was updated to
expect a `from` parameter, inspired by Capybara's `select` action.

One other notable change is that `GlSorting`'s sort direction button
tooltip and ARIA label now have the same value, which required a few
more feature spec fixes.

Addresses https://gitlab.com/gitlab-org/gitlab/-/issues/425440.