Add `@deprecated` tag to old labels components
What does this MR do and why?
This MR adds a @deprecated
tag to all the old app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue
components as we now have app/assets/javascripts/vue_shared/components/sidebar/labels_select_widget/labels_select_root.vue` instead.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.