This PR improves the installation checks for `vtsls`.
Previously we were checking the installed version of TypeScript against
the latest available version to determine whether we needed to installed
the `vtsls` language server or not.
However, these are two independent concerns, so we should be checking
individually whether `typescript` or `@vtsls/language-server` need to be
installed/updated.
Closes https://github.com/zed-industries/zed/issues/18349.
Release Notes:
- typescript: Fixed an issue where `@vtsls/language-server` may not have
been updated to the latest version.
16e9b4ceeb