“The test to set aside an order administratively dismissing an appeal is set out in Sickinger v. Sickinger, 2017 ONCA 760, at paras. 13-14. The overriding consideration is the justice of the case, which entails a consideration of the merits of the appeal. Further, the court considers factors analogous to those typically considered on a motion to extend time to appeal: (1) the explanation for not perfecting the appeal within the stipulated timelines; (2) the length of and explanation for the delay; and (3) prejudice to the respondent.”