Add model prepend mod for UserStatus and Project::Topic

Dave Liurequested to merge
daveliu/gitlab:jh-251-add-model-prepend-mod into master

In JH version we need to overwrite some methods in /jh holder, so we need add prepend_mod_method outside first.

Related JH Epic:

gitlab-jh&5273

Related JH Issue:

gitlab-jh/gitlab!128 (closed)

Edited by Dave Liu

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