Remove usage of labels_select_vue in jira_issues_sidebar_root

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~/vue_shared/components/sidebar/labels_select_vue/labels_select_root.vue is deprecated, and we should remove it from the Jira Issues sidebar (ee/app/assets/javascripts/integrations/jira/issues_show/components/sidebar/jira_issues_sidebar_root.vue).

Because labels on Jira Issues are read-only, we should be able to render the list of labels using the GlLabel component instead.