milestone_select: fix changing the milestone from the sidebar
What does this MR do?
milestone_select: fix changing the milestone from the sidebar
5d0a829d introduced a regression that prevented changing the milestone for an issue in the sidebar on the issue board. An import was added with the same identifier as a locally scoped variable. This changes the locally scoped variable identifier.
Fixes: https://gitlab.com/gitlab-org/gitlab-ce/issues/54139
What are the relevant issue numbers?
https://gitlab.com/gitlab-org/gitlab-ce/issues/54139
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.