Generate label ids for GlToggles leveraging lodash's uniqueId

The following discussion from gitlab!72902 (closed) should be addressed:

• @pgascouvaillancourt started a discussion: (+3 comments)

  thought: I can't help but wonder if those labels could have been generated randomly to prevent us from adding them manually and ensuring that no IDs can collapse on a single page.

Generate labelIds forGlToggles leveraging lodash's uniqueId function.