Only sortable columns will now have option to sort in UI.
Merge branch 'dev' into feature/column-sortation-tightening-up-9836
Removing currently selected sortable columns from lists in sorting modal.
Merge branch 'feature/round-off-sorting-dialog-8280' into feature/column-sortation-tightening-up-9836
Add unit test for sort option filtering in sorting modal
Merge branch 'feature/column-sortation-tightening-up-9836' of github.com:opf/openproject into feature/column-sortation-tightening-up-9836

Conflicts:
	app/assets/javascripts/angular/controllers/dialogs/sorting.js