Review and clean up dropdown.scss as necessary
As a follow up to https://gitlab.com/gitlab-org/gitlab-ui/-/merge_requests/2721, it was suggested that we can review and clean up the dropdown scss file to remove unnecessarily complex styles. Lets simplify our scss as much as a we can! See original comment: https://gitlab.com/gitlab-org/gitlab-ui/-/merge_requests/2721#note_893641821 > In the case of the dropdown styles, all of the different types of dropdowns are mostly grouped together (with the exception of most of the split dropdown styles), and so we run into this issue where updating one selector can update a few of them. If I were to address this, I would categorize the selectors by the dropdown type, then possibly have a short comment to guide future development to the correct group of selectors. Just a suggestion :slight_smile:
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