build: use vendored yarn script for installing Sass repositories (#45892)
build: use vendored yarn script for installing Sass repositories (#45892)

Fixes the Bazel analysis warning and the fact that Yarn is unnecessarily
downloaded by `rules_nodejs`.

```
DEBUG: /home/circleci/.cache/bazel/_bazel_circleci/9ce5c2144ecf75d11717c0aa41e45a8d/external/build_bazel_rules_nodejs/index.bzl:73:14: yarn_install#yarn attribute not set and no repository named 'yarn' exists; installing default yarn
```

PR Close #45892

gnomeontherun/angular,angular/angular,angular-indonesia/angular,JiaLiPassion/angular,gnomeontherun/angular,angular-indonesia/angular,JiaLiPassion/angular,gkalpak/angular,angular/angular,gkalpak/angular,gnomeontherun/angular,angular/angular,gnomeontherun/angular,angular-indonesia/angular,JiaLiPassion/angular,gkalpak/angular,JiaLiPassion/angular,angular-indonesia/angular,gkalpak/angular,angular/angular