Fix redirects from non gitlab docs

What does this MR do and why?

WHAT

• This MR fixes the bug for redirect URLs (both from and to paths) that are from docs in products other than gitlab.
• Examples in next section.

WHY

• We want redirects.yaml to have actual URLs that work.

Screenshots, screen recordings, or links to review app

A few examples,

  - from: /omnibus/build/team_member_docs/
    to: /omnibus/development/team_members/
    remove_date: 2026-07-01

  - from: /charts/advanced/multiple-databases/
    to: /charts/advanced/
    remove_date: 2026-03-09

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Configure a local GitLab Docs environment.
2. Check out this branch.

Merge request 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 merge request.