Add jh only feature flag

What does this MR do and why?

As title , Add jh only feature flag

We JH need add real_name_system feature_flag which is jh_only feature flag

See JH MR: gitlab-jh/gitlab!160 (merged)

See issue https://gitlab.com/gitlab-jh/gitlab/-/issues/318

@godfat-gitlab Could you please help review this, thanks.

CC @qianzhangxa

Edited by Zhu Shung

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