Add confirmation modal when deleting system label
**This is expected to become a no longer be a problem with the [introduction of workspaces](https://gitlab.com/groups/gitlab-org/-/epics/4257). As a result, it was decided to close for now.** In https://gitlab.com/gitlab-org/gitlab-ce/issues/48456 we applied the same UI/UX of the **project/group labels** pages to the **system labels** page. One of the things missing is to add the modal to confirm label deletion: ![image](/uploads/e662f5ca9807dc698a8fe7320cd234bf/image.png) `[label] will be permanently deleted and will not be added to new projects. Existing projects will not be affected. This cannot be undone.`
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