Removes `split_button.vue` from vue_shared
What does this MR do and why?
I was about to migrate the dropdown in this file and then I noticed that it's not actually imported anywhere.
Since there's a GitLab UI component for this now, the vue_shared version is both unused and redundant.
Deleting it
Screenshots or screen recordings
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How to set up and validate locally
- Run a grep for the regex
import.*vue_shared/components/split_button - Confirm it's not imported anywhere
- Rejoyce
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Related to #418030 (closed)
Edited by Sam Beckham