Rollup merge of #53617 - joshtriplett:tidy-no-license-header, r=Mark-Simulacrum
Rollup merge of #53617 - joshtriplett:tidy-no-license-header, r=Mark-Simulacrum

tidy: Stop requiring a license header

Previously approved in rust-lang/rust#43498 ; update tidy to match.

GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,graydon/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,aidancully/rust,graydon/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,GBGamer/rust