Add controller prepend mod for JH content validation service

Linjie Zhangrequested to merge
gitlab-jh/jh-team/gitlab:jh-247-add-controller-prepend-mod into master

We JH need 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#247

Related JH MR:

gitlab-jh/gitlab!128 (closed)

Edited by Linjie Zhang

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