[cherry-pick] Update unique and required constraints#3492

vkrasnovyd merged 7 commits intoOpenSlides:staging-t1/4.3.1OpenSlides/openslides-backend:staging-t1/4.3.1from

vkrasnovyd:apply/staging-t1/commit-1dc3010558371f685e397ce82db2123235c3f719vkrasnovyd/openslides-backend:apply/staging-t1/commit-1dc3010558371f685e397ce82db2123235c3f719Copy head branch name to clipboard