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:



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Co-authored-by: Lauris BH <lauris@nix.lv>
(cherry picked from commit c337ff0ec70618ef2ead7850f90ab2a8458db192)