Weight v1.5 Follow Ups (#12155)

* update api

* update

* remove unused

* remove `one` api

* fix unused

* fmt

* add saturating accrue

* remove `Weight::new()`

* use some macros

* div makes no sense

* Update weight_v2.rs

* missed some

* more patch

* fixes

* more fixes

* more fix

* more fix

* Update frame/support/src/weights/weight_v2.rs

* not needed

* fix weight file