Resolve frontend label spec disparity between CE and EE

As per https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/7966#note_109668810 and https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/7966#note_109668448, there are some discrepancies between the frontend specs for the following files:

• (UU) spec/javascripts/environments/environments_store_spec.js
• (UU) spec/javascripts/vue_shared/components/sidebar/collapsed_grouped_date_picker_spec.js
• (UU) spec/javascripts/vue_shared/components/sidebar/date_picker_spec.js
• (UU) spec/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value_collapsed_spec.js

This issue is for performing a preliminary investigation into why this disparity exists.