fix dropdowns for mr-versions
What does this MR do?
Change markup of mr version dropdowns to be in line with ui guidelines so that the dropdown content is scrollable.
Why was this MR needed?
Dropdowns were not scrolling.
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if you do - rebase it please) -
Squashed related commits together