Rename US banner AB test switch

[domlander]

What does this change?

Renames US banner AB test switch to make test file

[github-actions[bot]]

Deploy build 3151 of dotcom:frontend-all to CODE

All deployment options

- [Deploy build 3151 of `dotcom:frontend-all` to CODE](https://riffraff.gutools.co.uk/deployment/deployAgain?project=dotcom%3Afrontend-all&build=3151&stage=CODE&updateStrategy=MostlyHarmless&action=deploy) - [Deploy parts of build 3151 to CODE by previewing it first](https://riffraff.gutools.co.uk/preview/yaml?project=dotcom%3Afrontend-all&build=3151&stage=CODE&updateStrategy=MostlyHarmless) - [What's on CODE right now?](https://riffraff.gutools.co.uk/deployment/history?projectName=dotcom%3Afrontend-all&stage=CODE)

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From guardian/actions-riff-raff.

[prout-bot]

Seen on ADMIN-PROD (merged by @domlander 12 minutes and 15 seconds ago)

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[prout-bot]

Seen on FRONTS-PROD (merged by @domlander 14 minutes and 24 seconds ago)

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