Auto merge of #60683 - Centril:rollup-p05qh5d, r=Centril

Rollup of 8 pull requests

Successful merges:

 - #59348 (Clean up and add tests for slice drop shims)
 - #60188 (Identify when a stmt could have been parsed as an expr)
 - #60234 (std: Derive `Default` for `io::Cursor`)
 - #60618 (Comment ext::tt::transcribe)
 - #60648 (Skip codegen for one UI test with long file path)
 - #60671 (remove unneeded `extern crate`s from build tools)
 - #60675 (Remove the old await! macro)
 - #60676 (Fix async desugaring providing wrong input to procedural macros.)

Failed merges:

r? @ghost