Rollup merge of rust-lang#144053 - Kobzol:ci-remove-install-rust, r=jieyouxu

Remove install Rust script from CI

Windows ARM images should contain Rust now (actions/partner-runner-images#77 (comment)).

CC dpaoliello

try-job: `*aarch64-msvc*`

Author: jhpratt

.github/workflows/ci.yml

@@ -152,9 +152,6 @@ jobs:
       - name: show the current environment
         run: src/ci/scripts/dump-environment.sh
 
-      - name: install rust
-        run: src/ci/scripts/install-rust.sh
-
       - name: install awscli
         run: src/ci/scripts/install-awscli.sh