Follow-up from "Align note actions to Pajamas icon button styles"

The following discussions from !85245 (merged) should be addressed:

• @pgascouvaillancourt started a discussion:

  thought: It looks like the only remaining occurrence of the .link-highlight class in production code is suggestion_diff_header.vue where it is passed as to a GlIcon as the css-classes prop, which I don't think GlIcon even supports 🤔 Lets create a follow-up issue to confirm that the class isn't used and remove the associated styles.

• @pgascouvaillancourt started a discussion:

  thought: I don't know much about the emoji picker, but I wonder when the third icon ever shows up. We switch between the two first icons depending on the hover state, but the third one depends on the .is-active class being set on the button, which would look like this:

  

  But I don't remember ever seeing this while using the product 🤔 Perhaps this warrants another follow-up to make sure this variant is actually needed.

  edit: Oh, so this third variant is shown in HAML-based pickers, like in issues/MRs awards:

  

  But I don't think it works with the Vue picker, perhaps we should look into it.