Add prepend_mod to FreeUserCap
What does this MR do and why?
Add prepend_mod to FreeUserCap
Since GitLab announced upcoming changes to user limits on Free tier of GitLab SaaS, and add FreeUserCap
module and feature_flag to control this, but we JiHu don't want follow this strategy even after the feature flag is removed, so we JiHu need override some methods in FreeUserCap
namespace.
Related JH MR: JH!558
/cc @daveliu
Edited by Linjie Zhang