Improve stubs generation for Vue.js 3

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/128548



Merged-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Approved-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Reviewed-by: Illya Klymov <xanf@xanf.me>
Co-authored-by: Illya <iklymov@gitlab.com>