Rollup merge of #153061 - cyrgani:box-tests-2, r=Kivooeo

cleanup `tests/ui/box`, part 2

Followup to rust-lang/rust#152868.
I merged some of the slightly less trivial tests into `basic-operations.rs` and deleted several others entirely.

r? @Kivooeo (since you claimed the last one, but feel free to reassign)

Part of rust-lang/rust#133895.

Author: JonathanBrouwer