Remove duplicated password complexity code from JH

What does this MR do and why?

related to #695 (closed)

related to #402 (closed)

related to !210 (merged)

Upstream issue https://gitlab.com/gitlab-org/gitlab/-/issues/354966.

Upstream MR https://gitlab.com/gitlab-org/gitlab/-/merge_requests/82798.

Screenshots or screen recordings

Before	Without any password rules
	TODO

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.

• I have evaluated the MR acceptance checklist for this MR.