The Windows GitLab CI job has been updated to provision and use the
GCC-targeting Rust toolchain for MinGW builds, fixing job failures
caused by incomplete Rust setup and missing linker support.
* js/gitlab-ci-windows-rust:
ci(gitlab,windows): provide GNU Rust's host-linker support
ci(gitlab,windows): fix Rust setup for GitLab's MinGW build
ci(gitlab,windows): preserve exclusions during dependency setup
ci(gitlab,windows): provision GNU Rust for SDK-based MinGW builds