Merge branch '391169-vue3-migration-issuable_move_dropdown_spec' into 'master'

Remove direct data manipulation from issuable_move_dropdown_spec

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/118115



Merged-by: Tristan Read <tread@gitlab.com>
Approved-by: Scott de Jonge <sdejonge@gitlab.com>
Approved-by: Tristan Read <tread@gitlab.com>
Co-authored-by: Artur Fedorov <afedorov@gitlab.com>