Add prepend_mod on SaasRegistrationHelpers
What does this MR do and why?
Related JiHu issue: https://jihulab.com/gitlab-cn/gitlab/-/issues/3003
Add SaasRegistrationHelpers.prepend_mod to support Jihu's extension.
Screenshots or screen recordings
No UI changes.
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Zhiyuan Lu