Fixes #17453 This PR adds the abbility to block a user from a personal account or organization to restrict how the blocked user can interact with the blocker. The docs explain what's the consequence of blocking a user. Screenshots:    --------- Co-authored-by: Lauris BH <lauris@nix.lv>
* make repo as "pending transfer" if on transfer start doer has no right to create repo in new destination * if new pending transfer ocured, create UI & Mail notifications