What is the evidence from the Qur'an, Sunnah, and the consensus of scholars for the resurrection of all humankind on the Day of Judgment, and has any scholar held the view that the people of the fatrah will not be resurrected?

The gathering (Hashr) will not leave out any creature, including humans, jinn, and angels, as Allah Almighty said: {And [mention, O Muhammad], the Day We will remove the mountains and you will see the earth prominent, and We will gather them and not leave behind from them anyone} [Al-Kahf: 47]. The first and the last will be gathered on one plain for accountability. This has been affirmed by the texts of the Qur’an and Sunnah and the consensus of the predecessors, whereby even the people of the فترة (Fatrah - period between prophets) will be resurrected and tested.