Apply existing dropdown item styles to .dropdown-item class
What does this MR do?
Bootstrap 4 switched from <li> elements to .dropdown-item CSS class for dropdown items (see also https://bootstrap-vue.js.org/docs/components/dropdown). This makes sure they are styled the same way as existing dropdown items.
We currently don't use .dropdown-item anywhere but this change is required for gitlab-ui!83 (comment 122841904).
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides -
Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process. -
Security reports checked/validated by reviewer