Israel had not celebrated living in booths like this since the days of whom?

Answer: Joshua son of Nun

The returned exiles lived in booths, and not since the days of Joshua son of Nun had Israel celebrated like this.

“The whole assembly that had returned from exile made booths and lived in them. From the days of Joshua son of Nun until that day, the Israelites had not celebrated like this. And there was great rejoicing.”— Nehemiah 8:17 (BSB)