Better sorting of variants in variant picker and publishing dialogs

[madsrasmussen]

This PR changes the sorting for the variant picker on a node and all the dialogs related to publishing. The new sorting rules look like this:

• Always show default language first.
• Show all mandatory languages (first sorted by publishing state then name).
• Show all non-mandatory languages (first sorted by publishing state then name).
• The states are sorted like this: "Published", "Draft", "Not Created".

I have attached a screenshot of how the variant picker looks with the above sorting applied.

The same sorting rules also apply to segments. In the variant picker, the segments are shown as nested lists. In the publishing dialogs, the segments are shown underneath the language they relate to.

The following dialogs have been changed with new sorting:

• Save
• Publish
• Publish with descendants
• Unpublish
• Send for approval
• Schedule

How and what to test:

• Follow the instructions in this PR to get segments set up: Ability to configure Segmentation #7973
• Make sure everything is sorted correctly in the variant picker
• Make sure to test all the above-mentioned dialogs