[MODERATION] organization blocking a user (#802)

- Resolves #476
- Follow up for: #540
- Ensure that the doer and blocked person cannot follow each other.
- Ensure that the block person cannot watch doer's repositories.
- Add unblock button to the blocked user list.
- Add blocked since information to the blocked user list.
- Add extra testing to moderation code.
- Blocked user will unwatch doer's owned repository upon blocking.
- Add flash messages to let the user know the block/unblock action was successful.
- Add "You haven't blocked any users" message.
- Add organization blocking a user.

Co-authored-by: Gusted <postmaster@gusted.xyz>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/802
(cherry picked from commit 0505a10421)

models/user/block.go

@@ -53,10 +53,12 @@ func UnblockUser(ctx context.Context, userID, blockID int64) error {
 }
 
 // ListBlockedUsers returns the users that the user has blocked.
+// The created_unix field of the user struct is overridden by the creation_unix
+// field of blockeduser.
 func ListBlockedUsers(ctx context.Context, userID int64) ([]*User, error) {
 	users := make([]*User, 0, 8)
 	err := db.GetEngine(ctx).
-		Select("`user`.*").
+		Select("`forgejo_blocked_user`.created_unix, `user`.*").
 		Join("INNER", "forgejo_blocked_user", "`user`.id=`forgejo_blocked_user`.block_id").
 		Where("`forgejo_blocked_user`.user_id=?", userID).
 		Find(&users)