Move admin menu jobs under CI/CD section

What does this MR do and why?

Related to Move jobs nav item under CI/CD in admin area (#386311 - closed)

As Runners have been moved to the CI/CD section, Jobs is following.

Screenshots or screen recordings

How to set up and validate locally

Visit http://127.0.0.1:3000/admin/jobs and check the side navigation

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.