Add Copy project ID action

Proposal

Add Copy project ID to project dropdown actions

Implementation guide

1. Add ACTION_COPY_ID action to app/assets/javascripts/vue_shared/components/projects_list/project_list_item_actions.vue

{
  [ACTION_COPY_ID]: {
    text: __('Copy project ID'),
    action: this.onCopyId,
    extraAttrs: {
      'data-clipboard-text': this.project.id
    }
  }
}

onCopyId() {
  this.$toast.show(__('Project ID copied to clipboard.')
}