Add pagination to mirrors list

What does this MR do and why?

Contributes to https://gitlab.com/gitlab-org/gitlab/-/issues/580289

Problem

Mirror configuration page is missing pagination for mirrors.

Solution

• Extract remote mirror page into a custom template
• Add missing pagination logic

References

https://gitlab.com/gitlab-org/gitlab/-/issues/580289

How to reproduce

1. Visit a project page
2. Go to Settings -> Repository -> Mirroring repositories
3. Add push mirror configurations (more than 20 to trigger the pagination, or reduce the default limit to 2 and restart GDK)
4. You should see the pagination below the mirroring repositories table

Screenshots

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Related to #580289