Previously, test descriptions used `latest` to refer to the most recent/highest version. This was ambiguous, because `latest` can also refer to the stable version of a package (e.g. see `@latest` npm tag). This commit replaces `latest` with `highest` (or `highest for major`) to reduce ambiguity. Discussed in: https://github.com/angular/angular/pull/39853#discussion_r531730317 PR Close #39853