What is the ruling on reciting communal remembrances (dhikr) after the Tarawih prayer, such as "Subbuh, Subbuh, Quddus, Quddus, Rabb al-Mala'ikati wa al-Ruh"?

Nothing of what was mentioned was reported from the Messenger of Allah, peace and blessings be upon him, or his Companions. The fundamental principle in acts of worship is that they are contingent upon evidence; otherwise, the act would be an innovation (bid'ah). Therefore, it is obligatory to be cautious of this act and to advise those who perform it in a kind manner.