fix: agent cookie host assignment

[robaca]

Checklist

• I have ensured my pull request is not behind the main or master branch of the original repository.
• I have rebased all commits where necessary so that reviewing this pull request can be done without having to merge it first.
• I have written a commit message that passes commitlint linting.
• I have ensured that my code changes pass linting tests.
• I have ensured that my code changes pass unit tests.
  • multipart tests are green
• I have described my pull request and the reasons for code changes along with context if necessary in ticket 1807

[welecomtopython]

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[robaca]

What's preventing a merge here?

The multipart tests (which should not relate to my fix) are not working but as you can see here, they are not even causing a failing CI pipeline.