Merge branch '428422-fix-accessing-undefined-properties-on-vue-instances' into 'master'

Fix accessing undefined property job_group_dropdown test

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/176132



Merged-by: Lorenz van Herwaarden <lvanherwaarden@gitlab.com>
Approved-by: Lee Tickett <ltickett@gitlab.com>
Approved-by: Lorenz van Herwaarden <lvanherwaarden@gitlab.com>
Approved-by: Sofia Vistas <svistas@gitlab.com>
Reviewed-by: Miguel Rincon <mrincon@gitlab.com>
Reviewed-by: Lee Tickett <ltickett@gitlab.com>
Reviewed-by: Lorenz van Herwaarden <lvanherwaarden@gitlab.com>
Co-authored-by: Miguel Rincon <mrincon@gitlab.com>