make a "Cleanup Crew" ICE-breakers for bisection

[nikomatsakis]

Check list of things to do:

• Create a Github label ICEBreaker-Cleanup-Crew done
• Write a guide advising people on how to bisect-and-reduce and giving some high-level guidelines: add cleanup crew rustc-dev-guide#556
• Configure the rust-lang/rust repository to support the ICE-breakers commands, similar to this
• Create the cleanup crew toml file in team repo create ICEBreakers-Cleanup-Crew team team#214
• Create a sample PR for adding yourself, similar to add nikomatsakis to LLVM ICE-breakers team#140
• Link to the sample PR in this section of the rustc-guide
• Write an announcement blog post

[spastorino]

I was taking a look at some stuff today on cargo-bisect-rustc, I guess waiting or not depends on what's the minimum stuff you want to see on the tool.

[spastorino]

Configure the rust-lang/rust repository to support the ICE-breakers commands, similar to this

Done: rust-lang/rust#68581

Create a sample PR for adding yourself, similar to rust-lang/team#140

Done: rust-lang/team#221

Link to the sample PR in this section of the rustc-guide

Done: rust-lang/rustc-dev-guide#565

Write an announcement blog post

Done: rust-lang/blog.rust-lang.org#504