Fix Issue boards don't show milestone in issue details
What does this MR do?
Milestones were not being displayed in the issue board sidebar. Now use correct entity, API::Entities::Milestone
What are the relevant issue numbers?
https://gitlab.com/gitlab-org/gitlab-ce/issues/55301
Does this MR meet the acceptance criteria?
[ ] 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.~~
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Security reports checked/validated by reviewer