Rollup merge of #59236 - mati865:miri-preview, r=oli-obk
Rollup merge of #59236 - mati865:miri-preview, r=oli-obk

Rename miri component to miri-preview

It should fix installation via `rustup` and indicates it's not stable yet.

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