Follow-up from "fix(GlBreadcrumb): Include clipboard button in collapse calculation"

The following discussion from !5310 (merged) should be addressed:

• @vanessaotto started a discussion:

  There are two things I noticed now:

  1. After all the changes from slot to property, from using CSS Pseudo Elements to adding CSS Classes via JavaScript and back to CSS Pseudo Elements, I think we missed a change in the last MR: Shouldn't the last item be bold?
  2. In case the last item has a very long title, it just gets cut off. I think this is fine generally, as it is the same behavior as before. However, with a clipboard button at the end of the title, it might happen that this is not visible in the viewport.