Add user blocking (#29028)

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:


![grafik](4ed884f3-e06a-4862-afd3-3b8aa2488dc6)


![grafik](ae6d4981-f252-4f50-a429-04f0f9f1cdf1)


![grafik](ca153599-5b0f-4b4a-90fe-18bdfd6f0b6b)

---------

Co-authored-by: Lauris BH <lauris@nix.lv>

models/organization/org.go

@@ -400,6 +400,7 @@ func DeleteOrganization(ctx context.Context, org *Organization) error {
 		&TeamUnit{OrgID: org.ID},
 		&TeamInvite{OrgID: org.ID},
 		&secret_model.Secret{OwnerID: org.ID},
+		&user_model.Blocking{BlockerID: org.ID},
 	); err != nil {
 		return fmt.Errorf("DeleteBeans: %w", err)
 	}