Refactor to load vulnerability link from backend

This MR refactors the help page path to retrieve the information from our backend and pass it down to the Vue component via a data attribute. This will ensure consistency with the rest of our configuration page.

This MR does not introduce any design changes.

Screenshots or screen recordings

How to set up and validate locally

1. Go to the Security & Compliance page
2. Select the Vulnerability Management Tab
3. Click on the Learn more about vulnerability training link
4. It will go to this page:

https://docs.gitlab.com/ee/user/application_security/vulnerabilities/index.html#enable-security-training-for-vulnerabilities

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.

Related to #356279 (closed)