Fix nested lists interrupted by paragraphs losing structure and consecutive numbering.#20036

mmotyczynska wants to merge 2 commits intomasterckeditor/ckeditor5:masterfrom

ck/19127-pfo-continued-nested-lists-with-paragraphsckeditor/ckeditor5:ck/19127-pfo-continued-nested-lists-with-paragraphsCopy head branch name to clipboard