[EE] Refactor member view by using presenter
requested to merge ee-tmlee/gitlab-ce-28004-consider-refactoring-member-view-by-using-presenter into master
What does this MR do?
EE MR for https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/15715
Are there points in the code the reviewer needs to double check?
There are EE-specific changes (member override) that are encapsulated in the ee/ folder.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Review
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Has been reviewed by Backend
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Conform by the style guides -
Squashed related commits together