Remove obsolete a/b testing service (#22409)

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## Description

We’re removing this unused service.

## Related issues or tickets

https://docker.atlassian.net/browse/DKP-2125

## Reviews

<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->

- [ ] Technical review
- [ ] Editorial review
- [ ] Product review

Author: mat007

content/manuals/desktop/setup/allow-list.md

@@ -19,7 +19,6 @@ This page contains the domain URLs that you need to add to a firewall allowlist
 | ------------------------------------------------------------------------------------ | -------------------------------------------- |
 | https://api.segment.io                                                               | Analytics                                    |
 | https://cdn.segment.com                                                              | Analytics                                    |
-| https://experiments.docker.com                                                       | A/B testing                                  |
 | https://notify.bugsnag.com                                                           | Error reports                                |
 | https://sessions.bugsnag.com                                                         | Error reports                                |
 | https://auth.docker.io                                                               | Authentication                               |